required Selector
required Selector example
HTML
<form>
<input type="text" placeholder="Name">
<input type="email" placeholder="Email" required>
</form>
CSS
input:required{
border:1px solid blue;
}
<form>
<input type="text" placeholder="Name">
<input type="email" placeholder="Email" required>
</form>
input:required{
border:1px solid blue;
}