An example:
On your CSS:
.box1 { background-color: gray; }
.box2 { background-color: yellow; margin: 0 auto; padding: 10px; width: 60%; }
.box3 { border: 1px solid black; padding: 3px; }
On your HTML:
<div class="box1">
<div class="box2">
<div class="box3">Content here</div>
</div>
</div>
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solved how to write code for two background colors