html, body {
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
    height: 100%;
    margin: 0;
    padding-left: 5px;
    padding-right: 5px;
    padding-top: 2px;
    padding-bottom: 2px;
    padding: 5px;
}

hr {
    min-width: 100%;
}
.main-content {
    min-height: 0;
    flex: 1 1 auto;
    overflow-y: auto;
    overflow-x: hidden;
}

footer {
    flex-shrink: 0;
    line-height: 15px;
}
img {
    max-width: 100%;
    max-height: 35vh;
    object-fit: contain;
}