.social-icons-4 {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    list-style: none;
    margin: 10px;
}
.social-icons-4 a {
    display: inline-block;
    width: 60px;
    height: 60px;
    border-radius: 100%;
    background: #efefef;
    position: relative;
    margin: 5px;
    text-align: center;
    box-shadow: 0 2px 6px #c1c1c1;
    font-size: 32px;
    color: #337AB7;
    transition: 0.5s;
}
.social-icons-4 a img {
    width: 32px;
    height: 32px;
    margin-top: 14px;
}
.social-icons-4 a i,
.social-icons-4 a img {
    z-index:2;
    position: relative;
    line-height: 60px;
}
.social-icons-4 a:hover {
    color: #fff;
}
.social-icons-4 a:after {
    content: '';
    display: block;
    position: absolute;
    background: #BFE2FF;
    border-radius: 100%;
    width: 0;
    height: 0;
    transition: 0.3s;
    top: 0;
    left: 50%;
}
.social-icons-4 a:hover:after {
    width: 60px;
    height: 60px;
    margin-left: -30px;
    background: #337AB7;
}