[HTML] 언더라인(underline), 밑줄, 밑줄여백, 밑줄 여백

일반 밑줄

text-decoration

밑줄 여백

#line:after {

   content: '';

   width: 100%;

   height: 1px;

   display: block; 

   position: absolute; 

   margin-top: 10px; 

   border-bottom: 3px solid #f00;

}