构造:
<form class="demo-a">
<input placeholder="Search" type="search">
</form>
症结款式:
.demo-a input{width: 15px; border-radius: 10em; transition: all 0.5s ease 0s;}
.demo-a input:focus{width: 130px; box-shadow: 0 0 5px rgba(109,207,246,.5);}
现实效果图:
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