scanner.css

body, html {
    padding: 0;
    margin: 0;
    font-family: 'Helvetica Neue', 'Calibri', Arial, sans-serif;
    height: 100%;
}
body {
    background: #263238;
    display: flex;
    align-items: stretch;
    justify-content: stretch;
    height: 100%;
}
.sidebar {
    background: #eceff1;
    width: 25%;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    overflow: auto;
}
.sidebar h2 {
    font-weight: normal;
    font-size: 1.0rem;
    background: #607d8b;
    color: #fff;
    padding: 10px;
    margin: 0;
    position: sticky;
}
.preview-container {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    display: flex;
    width: 100%;
    overflow: hidden;
}
.btn{
    width: 95%;
    margin: 6px 8px;
    padding: 0;
    position: sticky;
}
section:first{
    text-align: center;
}
td{
    min-width: 30px;
    text-align: start;
    padding: 2px 8px;
}
td:not(tr:last-child){
    border-left: 1px #ccc solid;
}