style.css

/* If you're targeting IE 9, 10, 11 you can try */
@media screen and (min-width:0\0) { 
    /* Enter CSS here */
}

/* If it's only IE11 */
@media all and (-ms-high-contrast:none)
 {
 .foo { color: green } /* IE10 */
 *::-ms-backdrop, .foo { color: red } /* IE11 */
 }

/* If it's for IE10+ */
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {  
   /* IE10+ specific styles go here */  
}

/* Also, a Google search came up with this */
_:-ms-fullscreen, :root .ie11up { property:value; }

/* IE 6	IE 7	IE 8	IE 9	IE 10 */
@media screen\0 {…}	No	No	Yes	Yes	Yes
@media screen\9 {…}	Yes	Yes	No	No	No
@media \0screen {…}	No	No	Yes	No	No
@media \0screen\,screen\9 {…}	Yes	Yes	Yes	No	No
@media screen and (min-width:0\0) {…}	No	No	No	Yes	Yes