pre {
    /*max-height: 200px;*/
    overflow: auto;
    border: 1px solid #ccc;
    background-color: #fefefe;
    padding: 5px 10px;
}

html,
body {
    min-height: 100vh;
}

.waqad__main {
    min-height: calc(100vh - var(--max-footer-height) - var(--max-header-height));
}

.waqad__header {
    position: sticky;
    top: 0;
}