main content container clear, needs to be solid

Hi!!
here is a link to my site https://cheaptshirtsfast.com/
for some reason the container is clear and I need it to be solid. I have a basic knowledge of looking at code and being able to edit things like colors and so on..but this is boggling!!!

the following is the style.css file… PLEASE help… this is taking me wayyyyy too long for a one page site…. thank you soooo much in advance!!!!! ??

/*
Theme Name: F8 Lite
Theme URI: https://graphpaperpress.com/themes/f8-lite/
Description: A photography & multimedia portfolio theme for WordPress
Version: 4.2.1
Author: Thad Allender
Author URI: https://graphpaperpress.com
Tags: black, red, white, one-column, three-columns, fixed-width, custom-header, custom-background, threaded-comments, sticky-post, microformats, editor-style, photoblogging
License: GNU General Public License v2.0
License URI: https://www.gnu.org/licenses/gpl-2.0.html
*/

/************************* IMPORT GRID & NAV *************************/

@import url(css/screen.css);
@import url(css/nav.css);

/************************* DEFAULT STYLES ***************************/
body {
color:#222;
}

.container-inner {
width:950px;
margin:0 auto;
}

h1,h2,h3,h4,h5,h6 {
color:#000;
}

h1 a,h2 a,h3 a,h4 a,h5 a,h6 a {
color:#ff0000;
}

a {
color:#ff0000;
text-decoration:none;
}

a:hover,a:focus {
color:#222222;
}

/************************* RSS ************************************/
#inside-subscribe {
float:right;
color:#666;
}

#inside-subscribe a {
color:#666;
}

#inside-subscribe a:hover {
color:#000;
}

.feed {
margin-left:3px;
padding:0 0 0 19px;
background:url(images/rss.png) no-repeat 0 50%;
color:#eee;
}

/************************* SLIDESHOW ******************************/
#slideshow-posts {
margin-bottom:1em;
height:425px;
overflow:hidden;
}

ul#slideshow-nav {
margin:.5em 0;
padding:0;
}

ul#slideshow-nav a {
padding:5px 9px;
-moz-border-radius:12px;
-webkit-border-radius:12px;
border-radius:12px;
background:#ddd;
color:#fff;
margin:0 12px 0 0;
}

ul#slideshow-nav a.activeSlide,ul#slideshow-nav a:hover {
background:#aaa;
}

.slide {
padding:12px;
margin:0;
display:block;
overflow:hidden;
position:relative;
padding:0;
width:950px;
height:425px;
}

.slide .slide-image {
width:950px;
float:left;
}

.slide .slide-image img {
max-width:950px;
}

* html .slide-image img {
width:950px;
}

.slide .slide-image img.attachment-950×425 {
margin:0;
padding:0;
}

.slide .slide-details {
width:310px;
float:right;
margin-left:10px;
padding:2em;
background: url(images/overlay.png);
position:absolute;
top:20px;
right:20px;
}

.slide .slide-details h2 {
text-transform:uppercase;
border-bottom:1px solid #fff;
color:#fff;
font-weight:normal;
margin:0;
}

.slide .slide-details .description p {
color:#eee;
margin-top:10px;
font-size:1.1em;
}

.slide a {
color:#fff;
}

.slide a:hover {
color:#eee;
}

/************************* MASTHEAD ************************************/
#masthead {
background:padding: 0;
border-top:5px solid #222;
}

#masthead h4 {
margin:1em 0;
font-weight:bold;
text-transform:uppercase;
width:100%;
}

#masthead h4 a {
color:#333;
text-decoration:none;
float:left;
}

#masthead h4 a:hover {
color:#000;
}

#masthead span {
color:#666;
font-size:.8em;
text-transform:lowercase;
font-weight:normal;
}

#masthead span.description {
float:left;
margin-left:20px;
padding-top:.2em;
}

#masthead span.contact {
float:right;
line-height:1em;
}

#masthead span.contact a:hover {
color:#000;
}

img.headerimg {
margin-bottom:1em;
}

.sf-menu ul {
list-style:none;
padding:0;
margin:0 0 20px;
background-color:#222;
font-size:1em;
height:40px;
}

.sf-menu ul li {
text-align:left;
float:left;
height:40px;
margin:0;
background:#222;
border-right:1px solid #666;
padding:0;
}

.sf-menu ul li a {
display:block;
width:100px;
padding:7px 5px 22px 7px;
color:#fff;
font-size:11px;
text-decoration:none;
text-shadow:0 0 0 #000;
}

#navcontainer>.sf-menu ul li a {
width:auto;
height:auto;
height:8px;
}

.sf-menu ul li#active a {
background:#eee;
color:#222;
}

.sf-menu ul li a:hover,.sf-menu ul li#active a:hover {
color:#fff;
background-color:#000;
}

.sf-menu ul li.home {
border-left:none;
}

.sf-menu ul li li {
border:none;
border-bottom:1px solid #333;
}

/******************************** POSTS ************************* */
.post {
display:block;
clear:both;
}

.postmetadata {
color:#ccc;
}

.postmetadata a {
color:#ccc;
}

.postmetadata a:hover {
color:#000;
}

.underlined {
border-bottom:1px solid #000;
text-transform:uppercase;
}

h6.underlined {
margin:0 0 1em;
}

.navigation {
margin:0 auto;
text-align:center;
display:block;
width:300px;
}

.nav-image-left,.nav-image-up,.nav-image-right {
text-align:center;
float:left;
width:100px;
margin:10px 10px 10px 0;
}

.nav-image-left a,.nav-image-up a,.nav-image-right a {
padding:2px 48%;
text-decoration:none;
color:#222;
}

.nav-image-left a:hover,.nav-image-up a:hover,.nav-image-right a:hover {
color:#000;
}

.nav {
background:#eee;
margin:0 0 1em;
}

.nav:hover {
background:#ccc;
}

.prev a,.next a {
color:#000;
text-decoration:none;
padding:.2em 1em;
}

.nav-interior {
margin:0;
padding:0;
clear:both;
display:inline;
}

.nav-interior .next {
color:#000;
text-decoration:none;
float:right;
}

.nav-interior .prev {
color:#000;
text-decoration:none;
float:left;
}

/* ************************* FOOTER *********************** */
#footer {
margin:1em 0 0;
padding:1em;
}

#footer p {
text-align:center;
color:#ccc;
}

#footer a {
color:#666;
}

#footer a:hover {
color:#333;
}

/***************************** FLOATS & IMAGES ***************************** */
.right {
float:right;
}

.left {
float:left;
}

.middle {
margin:0 auto;
float:left;
}

.clear {
clear:both;
}

.centered {
display:block;
margin-left:auto;
margin-right:auto;
}

.aligncenter {
display:block;
margin-left:auto;
margin-right:auto;
}

.alignleft {
float:left;
}

.alignright {
float:right;
}

.thumbnail {
width:310px;
height:150px;
max-width:310px;
max-height:150px;
overflow:hidden;
}

.smallattachment {
margin:0 auto;
text-align:center;
}

.wp-caption {
border:1px solid #ddd;
text-align:center;
background-color:#f3f3f3;
padding-top:4px;
margin:10px;
-moz-border-radius:3px;
-khtml-border-radius:3px;
-webkit-border-radius:3px;
border-radius:3px;
}

.wp-caption img {
margin:0;
padding:0;
border:0 none;
}

.wp-caption-dd {
font-size:11px;
line-height:17px;
padding:0 4px 5px;
margin:0;
}

.wp-caption-text {
color:#888;
font-size:12px;
margin:5px;
}

.gallery-caption {
color:#888;
font-size:12px;
margin:0 0 12px;
}

/***************************** ARCHIVE *****************************/
h6.archive-header {
display:block;
border-bottom:#000 1px solid;
margin:0 0 .5em;
}

.archive-stack {
width:100%;
height:1em;
}

/***************************** ETC *****************************/
#filters {
clear:both;
height:2em;
margin-bottom:1em;
}

#filters li {
float:left;
margin-right:2em;
}

.prev {
}

.next {
}

/* remember to define focus styles! */
:focus {
outline:0;
}

/***************************** SEARCH *****************************/
#search {
margin:15px 0 0;
}

#search #s {
background:transparent url(images/search.png) 0 center no-repeat;
color:#666;
font-size:.9em;
margin:0 0 0 10px;
padding:3px 0 3px 20px;
width:120px;
}

#search input {
border:1px solid #ccc;
}

#search #s:hover {
color:#666;
}

.search-excerpt {
margin:0;
}

/************************* WIDGETS ************************************/
#inside-widgets {
margin:4em 0;
}

#inside-widgets h6.widgettitle {
color:#222;
border-bottom:1px solid #ccc;
text-transform:uppercase;
padding:1em .3em .5em;
}

#inside-widgets ul {
list-style:none;
margin:0 0 1.6em;
font-size:1em;
}

#inside-widgets ul li a,ul.txt li {
color:#222;
height:1%;
background:url(images/li.png) no-repeat 0;
line-height:1.2em;
border-bottom:1px solid #ccc;
display:block;
padding:6px 0 6px 8px;
}

#inside-widgets ul li a:hover,ul.txt li:hover {
color:#000;
background-position:1px .8em;
background:#eee url(images/li.png) no-repeat 3px 10px;
}

#inside-widgets ul li a span,ul.txt li,h4 a span {
color:#696455;
}

#inside-widgets ul li.active a {
cursor:default;
color:white;
}

#inside-widgets ul ul {
margin:0;
list-style:none;
}

/***************** COMMENTS ********************/
#comments {
clear:both;
width:70%;
margin:0 auto;
}

#comments .navigation {
padding:0 0 18px;
}

h3#comments-title,h3#reply-title {
color:#000;
font-size:20px;
font-weight:bold;
margin-bottom:0;
}

h3#comments-title {
padding:24px 0;
}

.commentlist {
list-style:none;
margin:0;
}

.commentlist li.comment {
border-bottom:1px solid #e7e7e7;
line-height:24px;
margin:0 0 24px;
padding:0 0 0 56px;
position:relative;
}

.commentlist li:last-child {
border-bottom:none;
margin-bottom:0;
}

#comments .comment-body ul,#comments .comment-body ol {
margin-bottom:18px;
}

#comments .comment-body p:last-child {
margin-bottom:6px;
}

#comments .comment-body blockquote p:last-child {
margin-bottom:24px;
}

.commentlist ol {
list-style:decimal;
}

.commentlist .avatar {
position:absolute;
top:4px;
left:0;
}

.comment-author {
}

.comment-author cite {
color:#000;
font-style:normal;
font-weight:bold;
}

.comment-author .says {
font-style:italic;
}

.comment-meta {
font-size:12px;
margin:0 0 18px;
}

.comment-meta a:link,.comment-meta a:visited {
color:#888;
text-decoration:none;
}

.comment-meta a:active,.comment-meta a:hover {
color:#ff4b33;
}

.commentlist .even {
}

.commentlist .bypostauthor {
}

.reply {
font-size:12px;
padding:0 0 24px;
}

.reply a,a.comment-edit-link {
color:#888;
}

.reply a:hover,a.comment-edit-link:hover {
color:#ff4b33;
}

.commentlist .children {
list-style:none;
margin:0;
}

.commentlist .children li {
border:none;
margin:0;
}

.nopassword,.nocomments {
display:none;
}

#comments .pingback {
border-bottom:1px solid #e7e7e7;
margin-bottom:18px;
padding-bottom:18px;
}

.commentlist li.comment+li.pingback {
margin-top:-6px;
}

#comments .pingback p {
color:#888;
display:block;
font-size:12px;
line-height:18px;
margin:0;
}

#comments .pingback .url {
font-size:13px;
font-style:italic;
}

/* Comments form */
input[type=submit] {
color:#333;
}

#respond {
border-top:1px solid #e7e7e7;
margin:24px 0;
overflow:hidden;
position:relative;
}

#respond p {
margin:0;
}

#respond .comment-notes {
margin-bottom:1em;
}

.form-allowed-tags {
line-height:1em;
}

.children #respond {
margin:0 48px 0 0;
}

h3#reply-title {
margin:18px 0;
}

#comments-list #respond {
margin:0 0 18px;
}

#comments-list ul #respond {
margin:0;
}

#cancel-comment-reply-link {
font-size:12px;
font-weight:normal;
line-height:18px;
}

#respond .required {
color:#ff4b33;
font-weight:bold;
}

#respond label {
color:#888;
font-size:12px;
}

#respond input {
margin:0 0 9px;
width:30%;
display:block;
}

#respond textarea {
width:98%;
}

#respond .form-allowed-tags {
color:#888;
font-size:12px;
line-height:18px;
}

#respond .form-allowed-tags code {
font-size:11px;
}

#respond .form-submit {
margin:12px 0;
}

#respond .form-submit input {
background:#222222;
border:medium none;
color:#FFFFFF;
cursor:pointer;
font-size:18px;
padding:10px 16px;
width:auto;
}

#respond .form-submit input:hover {
background: #000
}

/***************** WP STUFF ********************/
.bypostauthor {
}

.sticky {
background:#f2f7fc;
border-top:4px solid #000;
margin-left:-20px;
margin-right:-20px;
padding:18px 20px;
}