How to change button color and hover color?

.lmp_load_more_button .lmp_button {
display: inline-block;
padding: 12px 18px;
font-family: Alegreya Sans;
font-size: 19px;
color: #fff;
background-color: #222 ;
text-decoration: none;
line-height: 1em;
}
.lmp_load_more_button .lmp_button:hover {
display: inline-block;
padding: 12px 18px;
font-family: Alegreya Sans;
font-size: 19px;
color: #fff;
background-color: #eb0d48 ;
text-decoration: none;
line-height: 1em;
}

I am using this css, nothing change