一、横线

<div class="line" />

/* 横线 */
.line{
  float:right;
  width: 100%;
  height: 1px;
  margin-top: -0.5em;
  background:#d4c4c4;
  position: relative;
  text-align: center;
}

二、竖线

<div class="line" />

/* 竖线 */
.line{
  float: left;
  width: 0.1em;
  height: 2.5em;
  margin-right: 1em;
  margin-left: 3.5em;
  background:#f3f3f3;
}

三、分割线

<div class="tableLine"><span class="midText">我是华丽的分割线</span></div>

.tableLine {
    position: relative;
    margin: 0 auto;
    width: 600px;
    height: 1px;
    background-color: #d4d4d4;
    text-align: center;
    font-size: 16px;
    color: rgba(101, 101, 101, 1);
  }
 .midText {
    position: absolute;
    left: 50%;
    background-color: #ffffff;
    padding: 0 15px;
    transform: translateX(-50%) translateY(-50%);
  }