.editor .pic {
    float: left;
    width: 40%;
}
.editor .txt {
    float: right;
    width: 58%;
}

@media screen and (max-width: 900px) {
    .editor .pic,
    .editor .txt {
        float: none;
        width: auto;
    }
    .pic-group > .col {
        width: 33.33%;
        float: left;
    }
}
@media screen and (max-width: 500px) {
    .pic-group > .col {
        width: auto;
        float: none;
    }
}