.camera {
    width: 100%;
    padding: .16rem;
    font-size: .16rem;
}
.preview {
    width: 100%;
    height: 50px;
    line-height: 50px;
    text-align: center;
}
button {
    margin-top: .16rem;
}
.img,
video {
    width: 100%;
    margin-top: 15px;
}