<section class="main">
<div class="left-main">
<div class="container">
<div class="row">
123
</div>
</div>
</div>
<div class="right-main">
<div class="container">
<div class="row">
456
</div>
</div>
</div>
</section>
.main
.left-main
width: 50%
background: #3591d0
float: left
.right-main
width: 50%
background: #fff
float: left
.wrapper{
width: 100%;
min-height: 100vh;
position: relative;
}
.wrapper::before{
content: '';
display: block;
background: #3591d0;
position: absolute;
height: 100%;
width: 50%;
top: 0;
left: 0;
bottom: 0;
}
.wrapper::after{
content: '';
display: block;
background: #fff;
position: absolute;
height: 100%;
width: 50%;
top: 0;
right: 0;
bottom: 0;
}
<section class="wrapper">
<div class="container">
<div class="row">
<div class="col-md-6 col-sm-6 col-xs-6">
Левая часть
</div>
<div class="col-md-6 col-sm-6 col-xs-6">
Правая часть
</div>
</div>
</div>
</section>