This code can be used if you have a section inside an element with width already set and you wanted to make this section stretch the full width of the screen.
example code:
// main is set to have a max-width of 900px only
<div class="main">
<p>This paragraph is maxed at 900px wide only based on the .main parent div.</p>
<div class="fullwidth">
<p>This paragraph will stretch the whole with as I have add .fullwidth class in it. CSS for this class is shown below.</p>
</div>
</div>
.fullwidth {
width: 100vw;
position: relative;
left: 50%;
right: 50%;
margin-left: -50vw !important;
margin-right: -50vw !important;
max-width: unset !important;
padding: 0 !important;
}