.article h4 {
   border: none;
   font-size: 30px;
   margin: 10px;
   position: relative;
   z-index: -1;
}

.article h4::before {
   content: "";
   display: inline-block;
   width: 300px;
   height: 50px;
   background-image: url(----.png);
   background-repeat: no-repeat;
   background-size: contain;
   position: absolute;
   z-index: -2;
}