html {
    height: 100%
}
  
body {
    margin: 0;
    min-height: 100%;
    background-color: #ffffff;
    background-size: 100% 100%;
}

.center {
    margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
}
  
.contain {
    display:block;
    width:100%; height:100%;
    object-fit: contain;
}

.stretch {
    display:block;
    width:100%; height:100%;
}
  
.cover {
    display:block;
    width:100%; height:100%;
    object-fit: cover;
}
  
.bottom {
    position: absolute;
    bottom: 0;
    left: 50%;
    -ms-transform: translate(-50%, 0);
    transform: translate(-50%, 0);
}
  
.bottomLeft {
    position: absolute;
    bottom: 0;
    left: 0;
}
  
.bottomRight {
    position: absolute;
    bottom: 0;
    right: 0;
}