body{
    
   height: 100%;
   width: 100%;
   margin: 0 auto;
}

.card-img-top{

width: 250px;
height: 250px;

border: 4px solid black;
box-shadow: 0 0 10px rgba(0,0,0, .2);
justify-content: center;
align-items: center;
text-align:center;

}