Так?
<div class="section">
<div class="container">
<div class="section-description">
<h1>Description</h1>
<img src="http://cdn.iphonehacks.com/wp-content/uploads/2013/09/iphone_5c_ios_7.png" alt="image" />
</div>
</div>
</div>
body{
padding: 0;
margin: 0;
}
.section {
position: relative;
background-color: lightblue;
overflow: hidden;
min-height: 100vh;
}
.section::after{
content: "";
position: absolute;
top: 0;
right: -80%;
width: 100%;
height: 100%;
background-color: white;
transform: skew(45deg);
}
.section .container{
text-align: center;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
z-index: 1;
}