

HTML
<div id="border-btn">
<button>Hover me</button>
</div>````
CSS
#border-btn {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
button {
border: 0;
border-radius: 10px;
background: #2ec4b6;
text-transform: uppercase;
color: white;
font-size: 16px;
font-weight: bold;
padding: 15px 30px;
outline: none;
position: relative;
transition: border-radius 3s;
-webkit-transition: border-radius 3s;
}
button:hover {
border-bottom-right-radius: 50px;
border-top-left-radius: 50px;
border-bottom-left-radius: 10px;
border-top-right-radius: 10px;
}
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