header {
    position: relative;
    width: 100%;
    height: 320px;
    background: linear-gradient(180deg,  #83B6EB, #a3c9f0);
}

.header_top {
    width: 1200px;
    height: 120px;
    margin: 0 auto;
    padding-top: 17px;
}

.header_top li {
    padding-left: 20px;
    font-size: 13px;
    font-weight: 400;
    color: #031F50;
    line-height: 13px;
}

.header_top_left {
    float: left;
    display: flex;
    justify-content: flex-end;
}

.header_top_right {
    float: right;
    display: flex;
}

.header_center {
    position: relative;    
    width: 1200px;
    margin: 0 auto;
}

.header_center_bg {
    margin-left: -287px;
}

.header_center_left {
    position: absolute;
    top: 0px;
    left: 0px;
}

.header_center_left img {
    display: inline-block;
    vertical-align: middle;
}

.header_center_right {
    position: absolute;
    right: 0px;
    top: 120px;
}

.header_center_right input {
    width: 480px;
    height: 45px;
    border: 1px solid #235DDB;
    text-indent: 20px;
    border-radius: 20px;
    outline: none;
}

.header_center_right button {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 75px;
    border: 1px solid #Fff;
    background-color:  #fff;
}

@media (max-width: 480px)  {
    header {
        height: 180px;
    }

    .header_top {
        width: 100%;
        height: 60px;
        display: flex;
        flex-wrap: wrap;
        /* padding-bottom: 40px; */
    }

    .header_center {
        width: 100%;
    }

    .header_center_bg {
        margin-left: 0;
    }

    .header_center_left img {
        width: 90%;
        margin-left: 10px;
    }
    .header_center_right {
        right: 40px;
        top: 60px;
    }
    .header_center_right input {
        width: 250px;
    }
}