body{
    justify-content: start;
}

.model-img{
    width: 100%;
    height: 100vh;
    min-height: 20rem;
    display: flex;
    align-items:end;
    justify-content: center;
    position: relative;
}

.model-img .spinner-border{
    position: absolute;
    top: 50%;
    left: 45%;
}

header{
    z-index: 11;
}