<div class="section-1"> //черный
<div class="container">
<div class="row"><div class="col-md-12">111</div></div>
</div>
</div>
<div class="section-2"> //белый
<div class="container">
<div class="row"><div class="col-md-12">111</div></div>
</div>
</div>
<div class="section-3"> //черный
<div class="container">
<div class="row"><div class="col-md-12">111</div></div>
</div>
</div>
.menu li {
background: #1881C6;
display: inline;
}
.menu a {
display: block;
padding: 2%;
position: relative;
}
.menu a:after {
background: #FFFFFF;
content: " ";
display: block;
height: 10px;
position: absolute;
right: 0px;
top: 50%;
transform: translate(0, -50%);
width: 1px;
}
.menu li:last-child a:after {
display:none;
}