Use below CSS after title class.

.titleclass h3::after {
     background: #32baec;
     content: "";
     display: block;
     height: 1px;
     margin: 15px 0 0;
     max-width: 100px;
}

If you want to make center align use below css

.titleclass h3::after {
     margin: 15px auto;
}