HamSter

<h3 class="project-title">Заголовок</h3>
<p class="project-desc">Текст</p>

.box {
  position: relative; 
}

.box:before {    
   content: '';
    position: absolute;
    z-index: 1;
    right: 0;
    top: 0;
    bottom: 0;
    left: -9999px;
  background: ваш фон ;
}