body,
ul,
li,
p,
h1,
h2,
h3,
h4,
h5,
h6,
img,
br,
hr,
table,
tr,
td,
dl,
dt,
dd,
form {
    margin: 0;
    padding: 0;
}

body {
   
    font-family: Arial, "微软雅黑";
    font-size: 14px;
    color: #434343;
}

.clear {
    clear: both;
    font-size: 0px;
}

ul,
li {
    list-style: none;
}

img {
    border: none;
}

/*一般链接*/
a {
    text-decoration: none;
    color: #555;
    cursor: pointer;
    outline: 0;
}

a:hover {
    color: #3366ff;
}

.line_feed {
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
}

.hand {
    cursor: pointer;
}
.center{
    display: flex;
    justify-content: center;
}
.centerAll{
    display: flex;
    justify-content: center;
    align-items: center;
}
@media only screen and (min-width: 640px){
    .a{
        height: 96px;
        position: initial;
    }
    }
       
    @media only screen and (max-width: 640px){
     .a {
            border: none;
            height: 100vh;
            position: fixed;
            z-index: 9;
         /*height: 96px;*/
    }
    }