我想.test_info是宽度自动,与#test的宽度不一样.
https://jsfiddle.net/ef6ukobf/
#test { background: #26A65B; height: 30px; width: auto; margin-top: -8px; margin-left: -8px; margin-right: -8px; } .test_info { background: #00ff00; border-radius: 5px; height: 20px; width: auto; margin-top: -2px; margin-left: 20px; }
<div id="test"> <div class="test_info">50</div> </div>