inline-box

by redky

HTML

<button><span>确认提交</span></button>

<button>确认提交</button>

CSS

button {
  -webkit-appearance: none;
  border: 1px solid #000;
  background-color: #aaa;
  color: #fff;
  width: 100%;
  padding: 10px 0;
  margin: 10px;
}

button:before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 24px;
  background-color: #f00;
  vertical-align: middle;
}

span {
  display: inline-block;
  background-color: #faa;
  vertical-align: middle;
}