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              <p>【demo1】<span class="demo1">文字と同じ色で線を引く</span></p>

<p>【demo2】<span class="demo2">文字と別の色で下線を引く</span></p>

<p>【demo3】<span class="demo3">文字に合わせて蛍光ペン</span>で引いた</p>

<p>【demo4】<span class="demo4">太い蛍光ペン</span>で引いた</p>

<p>【demo5】<span class="demo5">細い蛍光ペン</span>で引いた</p>
  text-decoration: underline;


  border-bottom: 1px solid #f00;


  background: #ff0;


  background-color: #ff0;
  padding-top: 5px;
  padding-bottom: 5px;


.demo5 {
  background: linear-gradient(transparent 60%, #ff0 0%); 
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