@media screen and (-ms-high-contrast: active), screen and (-ms-high-contrast: none) {  
 header {
    position:relative !important;
    }
#slides {
position:relative !important;
}

}
@supports (-ms-ime-align: auto) {
 header {
    position:relative !important;
    }

#slides {
position:relative !important;
}
}