#cont {
    background-color: #002147;
    padding: 100px;
}

.middle {
    text-align: center;
}

.btn2 {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: #f1f1f1;
    margin: 10px;
    border-radius: 30%;
    box-shadow: 0 5px 15px -5px #ecf0f1;
    color: #3498db;
    overflow: hidden;
    position: relative;
}

a.btn2:hover {
    transform: scale(1.3);
    color: #f1f1f1;
}

.btn2 i {
    line-height: 50px;
    font-size: 20px;
    transition: 0.2s linear;
}

.btn2:hover i {
    transform: scale(1.3);
    color: #f1f1f1;
}

.fa-facebook-f {
    color: #3c5a99;
}

.fa-twitter {
    color: #1da1f2;
}

.fa-instagram {
    color: #e1306c;
}

.fa-google {
    color: #dd4b39;
}

.fa-youtube {
    color: #ff0000;
}

.btn2::before {
    content: "";
    position: absolute;
    width: 120%;
    height: 120%;
    background: #3498db;
    transform: rotate(45deg);
    left: -110%;
    top: 90%;
}

.btn2:hover::before {
    animation: aaa 0.7s 1;
    top: -10%;
    left: -10%;
}

@keyframes aaa {
    0% {
        left: -110%;
        top: 90%;
    }
    50% {
        left: 10%;
        top: -30%;
    }
    100% {
        left: -10%;
        top: -10%;
    }
}