html, body { height: 100%; margin: 0; padding: 0; font-family: "Microsoft YaHei", sans-serif; background-color: #f5f5f5; }
.container { display: flex; justify-content: center; align-items: center; height: 100vh; width: 100%; }
.message-box { background-color: #fff; padding: 30px 40px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); text-align: center; max-width: 90%; width: 400px; border-left: 5px solid #ff4d4f; }
.btn-back {margin-top: 10px;padding: 8px 20px;background-color: #ff4d4f;color: #fff;border: none;border-radius: 4px;cursor: pointer;font-size: 14px;}
.btn-back:hover { background-color: #e63c3e; }
h2 { color: #ff4d4f; margin-top: 0; font-size: 20px; }
p { color: #666; font-size: 14px; line-height: 1.6; }