*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,
body {
    background: url(./images/背景图.jpg) no-repeat center center;
    background-size: cover;
    background-attachment: fixed;
}
html {
    scroll-behavior: smooth;
}
li {
    list-style: none;
}
p {
    letter-spacing: 5px;
}
.header {
    width: 1380px;
    height: 50px;
    margin: auto;
    background:white;
    opacity: 0.8;
}
.logo {
    float: left;
    width: 350px;
    height: 50px;
    padding:0;
}
.logo h1 {
    font-size: 0;
}
.nav {
    float: left;
    width: 580px;
    height: 50px;
}

.nav li {
    margin-top: 20px;
    margin-left: 50px;
    float: left;
}
a {
    text-decoration: none;
    color: black;
}

.nav li a:hover {
    color: dodgerblue;
    border-bottom: 2px solid #175a4b;
}
.search {
    float: left;
    width: 260px;
    height: 28px;
    margin-top: 12px;
}
button {
    float:right;
   
}
.search button img {
    float: right;
    width: 28px;
    height: 27px;
}
.search input {
    width: 228px;
    line-height: 28px;
    border: 1px solid #818ed3;
}
.search input::placeholder {
    font-size: 14px;
    color: rgb(23, 67, 96);
}
.load {
    float:right;
    width: 100px;
    margin-top: 20px;
    margin-right: 20px;
}
.load a:hover {
    color: rgb(30, 85, 140);
    border-bottom: 2px solid #175a4b;
}
.suojin {
    text-indent: 2em;
    line-height: 2em;
}