/*适配苹果X*/
@media only screen and (device-width: 375px) and (device-height: 812px) and (-webkit-device-pixel-ratio: 3) {
    .header_nav {
        top: 44px;
    }
}

/*适配苹果X smart Max*/
@media only screen and (device-width: 414px) and (device-height: 896px) and (-webkit-device-pixel-ratio: 3) {
    .header_nav {
        top: 44px;
    }
}

/*适配苹果XR */
@media only screen and (device-width: 375px) and (device-height: 812px) and (-webkit-device-pixel-ratio: 2) {
    .header_nav {
        top: 44px;
    }
}

@media only screen and (device-width: 414px) and (device-height: 896px) and (-webkit-device-pixel-ratio: 2) {
    .header_nav {
        top: 44px;
    }
}

/*适配，6，7，8*/
@media only screen and (device-width: 375px) and (device-height: 667px) and (-webkit-device-pixel-ratio: 2) {
    
}

/*适配，6+，7+，8+*/
@media only screen and (device-width: 414px) and (device-height: 736px) and (-webkit-device-pixel-ratio: 3) {
   
}

/*适配，5*/
@media only screen and (device-width: 320px) and (device-height: 568px) and (-webkit-device-pixel-ratio: 2) {
   
}

/*适配，4*/
@media only screen and (device-width: 320px) and (device-height: 480px) and (-webkit-device-pixel-ratio: 2) {
 
}