Site-Title Color

Is there any way to change the color of the site-title without using a child theme? I tried changing the color: #000; to a new color and that didn’t work. Thanks
#header {
padding: 30px 0 0 0;
}
#site-title {
float: left;
font-size: 30px;
line-height: 36px;
margin: 0 0 18px 0;
width: 700px;
}
#site-title a {
color: #6633ff;
font-weight: bold;
text-decoration: none;