Create box width and Height ratio Thank Nghiep, go to link
<!--- code HTML -->
<div class="constant-width-to-height-ratio"></div>
# Code CSS
.constant-width-to-height-ratio {
background: #333;
width: 150px;
}
.constant-width-to-height-ratio::before {
content: '';
padding-top: 60%; // ratio
float: left;
}
.constant-width-to-height-ratio::after {
content: '';
display: block;
clear: both;
}