margin-top

margin-top: 1em;

margin-top: 10%;

margin-top: 10px;

margin-top: 0;

<section id="default-example">
  <div id="container">
    <div class="row"></div>
    <div class="row transition-all" id="example-element"></div>
    <div class="row"></div>
  </div>
</section>

#container {
  width: 300px;
  height: 200px;
  display: flex;
  align-content: flex-start;
  flex-direction: column;
  justify-content: flex-start;
}

.row {
  height: 33.33%;
  display: inline-block;
  border: solid #ce7777 10px;
  background-color: #2b3a55;
  flex-shrink: 0;
}

#example-element {
  border: solid 10px #ffbf00;
  background-color: #2b3a55;
}

/* <length> 值 */
margin-top: 10px; /* 绝对长度 */
margin-top: 1em; /* 相对与文本的大小 */
margin-top: 5%; /* 相对于最近的块容器的宽度 */

/* 关键字值 */
margin-top: auto;

/* 全局关键字值 */
margin-top: inherit;
margin-top: initial;
margin-top: revert;
margin-top: revert-layer;
margin-top: unset;

.content {
  margin-top: 5%;
}
.sidebox {
  margin-top: 10px;
}
.logo {
  margin-top: -5px;
}
#footer {
  margin-top: 1em;
}