body,
html {
    padding: 0;
    margin: 0;
    background: url('bg.png') repeat center center fixed;
    font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
}

* {
    box-sizing: border-box;
}

main {
    padding: 5rem 0;
    flex: 1 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

code {
    background: #dbeeff;
    border-radius: 5px;
    padding: .75rem;
    font-family: Menlo, Monaco, Lucida Console, Courier New, monospace;
}

.container {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.btn {
    padding: 10px 25px; /* 按钮内边距 */
    background-color: #529595; /* 蓝色背景 */
    color: white; /* 文字颜色为白色 */
    text-decoration: none; /* 去掉下划线 */
    border-radius: 5px; /* 边角圆滑度 */
    display: inline-block; /* 使其成为内联块级元素 */
    transition: background-color 0.3s ease; /* 过渡效果 */
    font-size: 14px; /* 设置字体大小 */
    margin: 0 10px; /* 上下间距0，左右间距10px */
}

.btn:hover {
    background-color: #427879; /* 鼠标悬停时的背景颜色变深 */
}