.top_box{
    width: 100%;
    height: 260px;
    background-image: url('../img/aboutback.png');
    background-size: 100%;
    background-repeat: no-repeat;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
}

.top_title_china{
    font-size: 3.5rem;
}
.top_title_english{
    font-size: 1.5rem;
}

.oil_refinery_list {
    padding: 1.5rem 10rem;
}

.about_titles{
    width: 100%;
    text-align: center;
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 20px;
    font-style: italic;
    /* text-shadow: 0px 5px 10px #666666; */
}

.about_title{
    width: 100%;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 500;
}

.shu_icon{
    width: 50px;
    height: 20px;
}

.about_content{
    margin: 1.5rem 0;
    font-size: 1rem;
}

.server_box{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 1.5rem 0;
}

.server_item{
    width: 15.5%;
    min-height: 270px;
    padding: 15px;
    background-color: #FFFFFF;
    display: flex;
    flex-direction: column;
    align-items: center;
    border-radius: 10px;
    box-shadow: 0px 0px 10px 10px #f5f7fa;
}

.server_icon{
    width: 60px;
    height: 60px;
}

.server_title{
    font-size: 1rem;
    margin: 10px 0;
}

.server_content{
    font-size: 0.9rem;
}

.advantage_box{
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 1.5rem 0;
}

.advantage_item{
    width: 32%;
    min-height: 270px;
    padding: 15px;
    background-color: #FFFFFF;
    border-radius: 10px;
    box-shadow: 0px 0px 10px 10px #f5f7fa;
}

.drop{
    color: #E4002B;
}