div.a {
    text-align: center;
}

.gonggao {
    display: block;
    position: absolute;
    width: 1200px;
    height: 500px;
    left: calc(calc(100% - 1200px)/2);
    top: 100px;
    border-style: solid;
    border-width: 2px;
    border-radius: 10px;
    border-color: rgba(112, 112, 112, 0.274);
    background-color: rgba(255, 255, 255, 0.205);
    backdrop-filter: blur(30px) brightness(100%) saturate(80%);

}

.neirong {
    display: -webkit-flex;
    display: flex;
    position: absolute;
    width: 1200px;
    height: 800px;
    left: calc(calc(100% - 1200px)/2);
    top: 620px;
    border-style: solid;
    border-width: 2px;
    border-radius: 10px;
    border-color: rgba(112, 112, 112, 0.274);
    background-color: rgba(255, 255, 255, 0.205);
    backdrop-filter: blur(30px) brightness(110%) saturate(70%);
}
.d1 {
    margin: 10px 30px;
}

.text1 {
    color: #000000cc;
}


.t2 {
    background: linear-gradient(to right, #c300ff, #00ffc8);
    background-clip: text;
    -webkit-text-fill-color: transparent;
}