body {
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
a {
text-decoration: none;
color: #262626;
font-family: sans-serif;
font-size: 45px;
border: 5px solid #262626;
padding: 40px 80px;
position: relative;
overflow: hidden;
}
a:before {
content: ”;
position: absolute;
left: 0;
top: 0;
background-color: #fff200;
height: 100%;
width: 100%;
z-index: -1;
transform-origin: bottom left;
transform: rotate(-90deg);
transition: transform 1s;
}
a:hover:before {
transform: rotate(0deg);
}