.head{
    width: 980px;
    height: 80px;
    margin: 0 auto;
    position: relative;
}
.logo{
    position: absolute;
    left: 100px;
    top: 15px;
}
.login{
    position: absolute;
    right: 100px;
    top: 34px;
    color: #ff9c00;
    cursor: pointer;
    font-size: 18px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #e3f2fd;
}

.navbar {
    background-color: #877b7e;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.navbar ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2rem;
}
.navbar ul li{
    position: relative;
    transition-duration: .5s;
}
.navbar ul li .p{
    position: absolute;
    top:0px;
    left: 0;
    width: 200%;
    background: rgba(0, 0, 0, .4);
    text-align: center;
    display: none;
    transition-duration: .5s;
    z-index: 100;
}
.navbar ul li:nth-child(1):hover .p{
    display: block;
    transition-duration: .5s;
    top: 24px;
    left: -18px;
}
.navbar ul li .p a{
    color: #fff;
    font-size: 14px;
    /* background-color: red; */
    border-bottom: 2px solid yellow;
    padding: 0 0 4px 0;
    line-height: 30px;
}


.navbar a {
    text-decoration: none;
    color: #1565c0;
    font-weight: bold;
    font-size: 1.1rem;
}

.navbar a:hover {
    color: #003c8f;
}

footer {
    background-color: #393536;
    text-align: center;
    padding: 1rem;
    position: fixed;
    bottom: 0;
    width: 100%; /* 固定宽度 */
    margin: 0 auto; /* 居中显示 */
    left: 0;
    right: 0;
    color: #fff;
}