section.social_container {
    margin: 0;
}
section.social_container ul {
    list-style: none;
    padding-left: 0;
    text-align: center;
}
section.social_container ul li {
    display: inline-block;
    padding: 10px;
}
section.social_container ul li a {
    text-decoration: none;
}

section.social_container ul li a img {
    height: 50px;
}

section.social_container .socialicon {
    height: 50px;
    width: 50px;
    transition: all 0.4s ease;
}
/* O atributo fill deve estar no tag svg para isso funcionar */
section.social_container .socialicon:hover {
    fill: #FFF;
    -ms-transform: scale(1.4); /* IE 9 */
    -moz-transform: scale(1.4); /* Firefox */
    -webkit-transform: scale(1.4); /* Safari */
    transform: scale(1.4);
}