@media only screen and (min-width:750px) and (max-width: 1920px) {
    main-m {
        display: none;
    }

    .header {
        display: flex;
        width: 100%;
        background-color: #fff;
        justify-content: space-between;
    }

    .logo-container {
        display: flex;
        /* background-color: #d9ebe1; */
        width: 50%;
        height: 100px;
    }

    .menu-container {
        display: flex;
        /* background-color: yellow; */
        width: 50%;
        height: 100px;
        justify-content: flex-end;
    }

    .logo-container .logo {
        background: url(../image/logo.png) no-repeat center;
        background-size: contain;
        width: 160px;
        z-index: 9;
        margin-left: 45px;
        margin-top: 20px;
        cursor: pointer;
    }

    .menu {
        background: url(../image/menu.png) no-repeat center;
        background-size: cover;
        width: 43px;
        height: 44px;
        z-index: 9;
        margin-top: 25px;
        margin-right: 45px;
    }
}

/* 小于750的时候显示 */
@media only screen and (max-width: 750px) {
    .container1 {
        display: flex;
        width: 100vw;
        height: 70px;
        background-color: #fff;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        z-index: 10;

    }

    .hamburger {
        position: relative;
        display: block;
        width: 35px;
        /* height: 35px; */
        cursor: pointer;
        appearance: none;
        background: none;
        outline: none;
        border: none;
        z-index: 9999;
        margin-right: 30px;
    }

    .hamburger .bar,
    .hamburger:after,
    .hamburger:before {
        content: '';
        display: block;
        width: 100%;
        height: 4px;
        /* background-color: #fff; */
        background-color: #eb6100;
        margin: 5px 0;
        transition: .4s;
    }

    .hamburger.is-active:before {
        transform: rotate(-45deg) translate(-8px, 7px);
    }

    .hamburger.is-active:after {
        transform: rotate(45deg) translate(-5px, -5px);
    }

    .hamburger.is-active .bar {
        opacity: 0;
    }

    .mobile-nav {
        position: fixed;
        display: block;
        top: 0;
        left: 100%;
        width: 100%;
        min-height: 100vh;
        background-color: #101010;
        z-index: 10;
        padding-top: 100px;
        transition: .4s;
    }

    .mobile-nav.is-active {
        left: 0
    }

    .mobile-nav a {
        display: block;
        width: 100%;
        min-width: 200px;
        text-align: center;
        margin-bottom: 16px;
        padding: 12px 16px;
        /* background-color: #e16217; */
        color: #fff;
        font-size: 1.5rem;
        font-weight: bold;
    }


    .two_level_menubar {
        display: none;
        margin-left: 8px;
        font-size: 14px;
    }

    .two_level_menubar li {
        border-left: 1px dashed #000000;
    }

    .sub1 {
        font-size: 1.2rem !important;
    }

    .mhead {
        display: flex;
        width: 100vw;
        height: 80px;
        /* background-color: red; */
        justify-content: space-between;
        align-items: center;
        z-index: 9;
    }

    .mlogo {
        width: 100px;
        height: 80px;
        background-color: #fff;
        background: url(../image/logo.png) no-repeat center;
        background-size: contain;
        margin-left: 20px;
    }

    .mmenu {
        width: 40px;
        height: 40px;
        background-color: #fff;
        margin-right: 20px;
    }
}