body { font-family: Arial, sans-serif; margin: 10px; }
header { background:#1976d2; color:white; padding:10px; }
.warning { font-size:0.9em; }
input, select, button { width:100%; margin:5px 0; padding:8px; }
#list div { border-bottom:1px solid #ddd; padding:5px; }
.hidden { display:none; }
button { background:#1976d2; color:white; border:none; }