*{
    margin: 0;
    padding: 0;
}
h1{
    font-weight: normal;
}
ul, ol, li{
    list-style: none;
    margin: 0;
    padding: 0;
}
img{
    display: block;
}
.banner{
    width: 960px;
    margin: auto;
}
body{
    font-family: "Times New Roman",Georgia,Serif!important;
    font-size: 18px;
}
i,b{
    font-style: normal;
}
/* .item-container{
    margin-top: 30px;
} */
.item-title{
    height: 30px;
    line-height: 30px;
    width: 260px;
    background-color: rgb(126,205,231);
    padding-left: 10px;
    border-radius: 6px 6px 0 0;
    color: white;
    margin-bottom: 2px;
    font-size: 18px;
}
.clear::after{
    content: "";
    display: block;
    height: 0;
    width: 0;
    visibility: hidden;
    clear: both;
}
.text-nowrap{
    white-space: normal;
    word-wrap: break-word;
    word-break: break-all;
}
.nav-left{
    position: fixed;
    top: 80px;
    left: 20px!important;
    border: 1px solid lightgray;
    width: 180px;
    box-shadow: 0 1px 6px 0 rgb(0 0 0 / 12%), 0 1px 6px 0 rgb(0 0 0 / 12%);
    background-color: white;
    backface-visibility: hidden;
    z-index: 1;
}
.nav-left .nav-title{
    margin-top: 30px;
    line-height: 30px;
    height: 30px;
    font-size: 22px;
    margin-bottom: 20px;
    padding-left: 20px;
}
.nav-left .nav-item{
    height: 30px;
    line-height: 30px;
    margin-bottom: 20px;
    cursor: pointer;
    padding-left: 20px;
    cursor: pointer;
    text-decoration: underline;
}
.nav-item.active{
    color: orange;
}
.nav-left .nav-item:hover{
    color: orange;
}
.nav-left .nav-item:last-of-type{
    margin-bottom: 30px;
}
.button:hover{
    background-color: lightblue;
}
.container{
    width: 80%;
    margin: auto;
    padding: 0px;
}
.button{
    position: relative;
    height: 30px;
    line-height: 30px;
    width: 160px;
    background-color: white;
    text-align: center;
    border-radius: 5px 5px;
    box-shadow: 2px 2px 1px 0 lightgray;
    cursor: pointer;
    border: 1px solid gray;
}