Name the CSS Class of the Module "testimonial-line".
Use this CSS Code: 
 
.testimonial-line .et_pb_testimonial_author {
margin-top: 35px !important;
}
.testimonial-line .et_pb_testimonial_description_inner::after {
content: "";
position: absolute;
text-align: center;
width: 40%;
left:50%;
margin-top: -40px;
border-top: 1px solid #939290;
-webkit-transform: translateX(-50%);
-ms-transform: translateX(-50%);
transform: translateX(-50%);
}