DarkCodeClone/button.css at master · geonwoomun/DarkCodeClone · GitHub

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body{
    margin : 0;
    padding :0;
}

.container {
    text-align : center;
    margin-top : 360px;
}

.btn {
    border:1px solid #3498db;
    background : none;
    padding : 10px 20px;
    font-size : 20px;
    font-family : "montserrat";
    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:#3495db;
}

.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%;
}