html {
    margin: 0;
    width: 100%;
    height: 1000px;
    overflow: hidden;
}
body {
    background: black url("../img/BHLogo.png") no-repeat center;
}
.social {
    margin-top: 50px;
    text-align: center;
}
.social a {
    outline: none;
}
.social img {
    margin: 25px;
}
.social img:hover {
    filter: opacity(0.5) drop-shadow(0 0 0 blue);
}