CodePen Embed - css selector

<div class="box">
  <button>123</button>
  <button>444</button>
  <button>2345</button>
  <button>ertw</button>
</div>

.box{
  border: 1px solid;
}

button{
  margin-left: 50px;
}


/* 
  兄弟选择器
  选择紧接在一个元素后的元素，且二者有相同的父元素。
*/
button + button{
  margin-left: 2px;
}

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