.ann{
    width: 1280px;
    margin: 0 auto;
    overflow: hidden;
}
body{
    background: rgb(245, 245, 245);
    color: rgba(0, 0, 0,0.85);
}
.ann-poster{
    width: 100%;
    height: 250px;
    background: lightblue;
}
.ann-poster-title{
    width: 1280px;
    margin: 0 auto;
    font-size: 50px;
    color: white;
    line-height: 250px;
}
.ann-item{
    background: white;
    padding: 30px 30px;
    border-radius: 3px;
    margin-top: 30px;
    box-shadow: 0px 2px 3px rgb(0 0 0 / 10%);
    
}
.ann-more svg{
    width: 40px;
    height: 40px;
    transform: rotate(90deg);
    transition: 0.2s;
    margin: 0 auto;
    display: block;
    cursor: pointer;
    margin-top: 15px;
    margin-bottom: -15px;
}
.ann-more g{
    fill: #1b75bb;
    transition: 0.1s;
}
.ann-more svg:hover g{
    fill: #faaf41;
}
.ann-title{
    font-size: 20px;
    color: #1b75bb;
}
.ann-desc{
    margin-top: 10px;
    max-height: 95px;
    overflow: hidden;
    line-height: 19px;
    transition: 0.2s linear;
}
.ann-date{
    color: #1b75bb;
    
    font-size: 16px;
}

.ann-con{
    width: calc(100% - 330px);
    float: left;
}
.ann-windows{
    float: right;
    width: 300px;
}
.ann-window{
    height: 400px;
    width: 300px;
    margin-top: 30px;
    background: yellowgreen;
}