h4 {
     position: relative;
     padding-bottom: 0.5em;
}
 
h4::after {
     position: absolute;
     content: '';
     left: 0;
     bottom: 0;
     width: 100%;
     height: 7px;
     box-sizing: border-box;
     border-top: 3px solid #DE766B;
     border-bottom: 1px solid #DE766B;
}

/*蛍光ペン*/
.kasenyellow{background:rgba(0, 0, 0, 0) linear-gradient(transparent 60%, #ffffbc 0%) repeat scroll 0 0;}

.kasenpink{background:rgba(0, 0, 0, 0) linear-gradient(transparent 60%, #FFDFEF 0%) repeat scroll 0 0;}

.kasenblue{background:rgba(0, 0, 0, 0) linear-gradient(transparent 60%, #cce5ff 0%) repeat scroll 0 0;}