Effet de survol de bouton CSS

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HTML

CSS

body {
    background: #44A08D;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #093637, #44A08D);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #093637, #44A08D); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
    
}
.btn {
    cursor: pointer;
    position: relative;
    padding: 10px 20px;
    background: rgb(3, 247, 226);
    font-size: 28px;
    border-top-right-radius: 10px;
    border-bottom-left-radius: 10px;
    transition: all 1s;
}
.btn:after, .btn:before {
    content: " ";
    width: 10px;
    height: 10px;
    position: absolute;
    border: 0px solid #fff;
    transition: all 1s;
}
.btn:after {
    top: -1px;
    left: -1px;
    border-top: 5px solid black;
    border-left: 5px solid black;
}
.btn:before {
    bottom: -1px;
    right: -1px;
    border-bottom: 5px solid black;
    border-right: 5px solid black;
}
.btn:hover {
    border-top-right-radius: 0px;
    border-bottom-left-radius: 0px;
}
.btn:hover:before, .btn:hover:after {
    width: 100%;
    height: 100%;
}
.data-container {
    background: #ffebee;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}