#157

<div class="custom-email">
<img src="https://static1.squarespace.com/static/644f2654b9c076768430cf4b/t/663d9c5d08d34019b9679af3/1715313757328/creative.pn" />
<div class="color-bar">
</div>
</div>
<style>
.color-bar {
  display: block;
  width: 100%; 
  height: 15px; 
  background-color: #ffd877;
  margin-top: 30px;
}
.color-bar { 
border-bottom: 1px solid #000;
}
</style>

Demo: https://jsfiddle.net/735xbtrg/1/