body {
    background: #ddd;
    min-height: 100vh;    
}

.midpanel {
    margin: 0 auto;
    max-width: 484px;
    padding: 20px 10px;
    box-shadow: 0 6px 20px 0 rgba(0, 0, 0, 0.19)
}

.mt-50 {
    margin-top: 50px
}

.mb-50 {
    margin-bottom: 50px
}