<!DOCTYPE html>
<body>
<div>
<div class="text">123321123321</div>
<input type="text" />
</div>
</body>
<style>
.text {
font-size: 1.75vmin;
color: red;
}
input {
width: 100%;
height: 4.5vmin;
background: green;
}
</style>
</html>
Простой
Простой
