.main {
    background: url(../img/bg.jpg) no-repeat bottom;
    min-height: 100vh;
    padding: 2em 0;
    position: relative;
    z-index: 1;
    display: grid;
}
.main:before {
    position: absolute;
    content:'';
    top:0;
    left: 0;
    bottom: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: -1;
}
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

h1, h2 {
    text-align: center;
    color: #fff;
    font-family: 'LiSu';
    font-size:50px;
}
a{
    color:#fff;
    text-align: center;
}
a:hover{
    color:#6fe658;
}
form {
    text-align: center;
    margin-bottom: 20px;
}

input[type="text"] {
    width: 400px;
    height: 45px;
    background-image: url(搜索.png);    /*搜索框背景图片*/
    background-repeat: no-repeat;        /*设置背景图片不平铺*/
    border-radius: 30px 0px 0px 30px;  
    padding-left: 50px;
    background-position: 10px 10px;       /*设置背景图片的位置*/
    color:darkgray;
    font-size: 18px; 
    border: none;
}

button {
    width: 90px;
    height: 47px;
    border: none;
    background-color: #6fe658;
    color: #fff;
    border-radius: 0px 20px 20px 0px;
    font-size: 20px;
    cursor: pointer;
}

button:hover {
    background-color: #4e494b;
}
#default {
    display:block;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #f2efef;
    width: 60%; /* 缩小 iframe 框 */
    height: 400px;
    margin: 0 auto; /* 水平居中 */
    overflow: auto;
}