*{
    padding: 0;
    margin: 0;
}
/*
input[type=text] {
    display: inline;
    width: 80%;
    box-sizing: border-box;
    border: 2px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    background-color: white;
    background-image: url('https://static.runoob.com/images/mix/searchicon.png');
    background-position: 10px 10px;
    background-repeat: no-repeat;
    padding: 12px 20px 12px 40px;
}
*/
#grad1 {
    height: calc(100vh - 10rem);
    background-repeat: no-repeat;
    background-image: linear-gradient(135deg, #303958 10%, #208072 100%);
    padding: 4rem 0;
}

.button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    -webkit-transition-duration: 0.4s; /* Safari */
    transition-duration: 0.4s;
}

.button2:hover {
    box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

h1 {
    text-shadow: 3px 3px 3px #9198e5;
    text-align: center;
    color: #ccc;
}

/* 下拉按钮样式 */
.dropbtn {
    background-color: #4CAF50;
    color: white;
    padding: 15px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

/* 容器 <div> - 需要定位下拉内容 */
.dropdown {
    position: relative;
    display: inline-block;
}

/* 下拉内容 (默认隐藏) */
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 150px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
}

/* 下拉菜单的链接 */
.dropdown-content a {
    color: black;
    padding: 12px 15px;
    text-decoration: none;
    display: block;
}

/* 鼠标移上去后修改下拉菜单链接颜色 */
.dropdown-content a:hover {
    background-color: #f1f1f1
}

/* 在鼠标移上去后显示下拉菜单 */
.dropdown:hover .dropdown-content {
    display: block;
}

/* 当下拉内容显示后修改下拉按钮的背景颜色 */
.dropdown:hover .dropbtn {
    background-color: #3e8e41;
}