* {box-sizing: border-box;}

.container-img
{
    border: thin solid #770000;
    position: relative; /* width: 50%;
  max-width: 300px; */
}

.image-img {
  display: block;
  width: 100%;
  height: auto;   
  
}



.overlay-img {
  position: absolute; 
  bottom: 0; 
  background: rgb(0, 0, 0);
  background: rgba(0, 0, 0, 0.5); /* Black see-through */
  color: #f1f1f1; 
  width: 100%;
  transition: .5s ease;
  opacity:0;
  color: white;
  font-size: 20px;
  padding: 20px;
  text-align: center;
}

.container-img:hover .overlay-img {
  opacity: 1;
}