main {
    min-height: calc(100vh - 3rem);
    display: grid;
    place-items: center;
    
}
.container {
    height: 500px;
    position: relative;
    border: 3px solid ;
    background-color: aliceblue;
}
  
.vertical-center {
    margin: 0;
    padding: 25%;
    position: absolute;
    top: 50%;
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
    
}