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HTML

<p>텍스트 밑줄 형광펜 <span class="bottom-line">텍스트 밑줄 형광펜 효과</span></p>

CSS

.bottom-line { 
border-bottom: 1px solid #b0e0e6; 
  box-shadow: inset 0 -2px 0 #b0e0e6;
  }