wxappb2b/GuangZuan/miniprogram/style/vant.less

.van-button--primary:not(.van-button--plain) {
    background-color: var(--color-primary) !important;
    border-color: var(--color-primary) !important;
}

.van-button--plain.van-button--primary {
    color: var(--color-primary) !important;
    border-color: var(--color-primary) !important;
}