.flex-container{
display: -webkit-box; /* Chrome 4+, Safari 3.1, iOS Safari 3.2+ */
display: -moz-box; /* Firefox 17- */
display: -webkit-flex; /* Chrome 21+, Safari 6.1+, iOS Safari 7+, Opera 15/16 */
display: -moz-flex; /* Firefox 18+ */
display: -ms-flexbox; /* IE 10 */
display: flex; /* Chrome 29+, Firefox 22+, IE 11+, Opera 12.1/17/18, Android 4.4+ */
}
或者
.flex-container {
display: -moz-box; /* Firefox */
display: -ms-flexbox; /* IE10 */
display: -webkit-box; /* Safari */
display: -webkit-flex; /* Chrome, WebKit */
display: box;
display: flexbox;
display: flex;
}