CSS-Button-Effect/Button-Hover.css at master · PriontoAbdullah/CSS-Button-Effect · GitHub

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@import url('https://fonts.googleapis.com/css?family=Poppins:400,500,600,700,800,900&displayer=swap');

#button-hover{
    margin: 0;
    padding: 0;
    height: 30vh;
}

#button-hover .container{
    text-align: center;
    margin-top: 150px;
}

#button-hover .btn{
    border: 1px solid #3498db;
    background: none;
    padding: 10px 20px;
    font-size: 20px;
    font-family: 'Poppins', sans-serif;
    cursor: pointer;
    margin: 10px;
    transition: 0.8s;
    position: relative;
    overflow: hidden;
}

.btn1, .btn2{
    color: #3498db;
}

.btn3, .btn4{
    color: #fff;
}

.btn1:hover, .btn2:hover{
    color: #fff;
}


.btn3:hover, .btn4:hover{
    color: #3498db;
}

.btn::before{
    content: "";
    position: absolute;
    left: 0;
    width: 100%;
    height: 0%;
    background: #3498db;
    z-index: -1;
    transition: 0.8s;
}

.btn1::before, .btn3::before{
    top: 0;
    border-radius: 0 0 50% 50%;
}

.btn2::before, .btn4::before{
    bottom: 0;
    border-radius: 50% 50% 0 0;
}

.btn3::before, .btn4::before{
    height: 180%;
}

.btn1:hover::before, .btn2:hover::before{
    height: 180%;
}

.btn3:hover::before, .btn4:hover::before{
    height: 0%;
}