I search the solution on this forum and on internet, most solution available but nothing work for my case... Or I don't understand maybe.
I have a background image, and I would like this take 100% of width and same value for the height.
.top-section {
background: url('../img-content/Bg1.png') no-repeat center center fixed;
background-size: cover;
}
<div class="top-section"></div>