MTP20_WEB_GLOBAL/src/packages/gstj/components/base/qrcode-scan/index.less

.app-qrcode-scan {
    &__camera {
        position: fixed;
        bottom  : 0;
        left    : 0;
        z-index : 1000;
        width   : 100vw;
        height  : 30vh;
    }
}