body {
"
            "  margin: 0;
"
            "  font-family: Arial, sans-serif;
"
            "  background: #f7fafc;
"
            "  color: #1f2937;
"
            "}
"
            "main {
"
            "  max-width: 720px;
"
            "  margin: 64px auto;
"
            "  padding: 24px;
"
            "  background: #ffffff;
"
            "  border: 1px solid #e5e7eb;
"
            "  border-radius: 12px;
"
            "}
"