Sidebars: background color and border

I have several websites setup with Betheme template. I have been using the following custom CSS codes to set sidebar background color and hide the border:

.widget-area:before { background: #fff; }
.with_aside.aside_both .sidebar-1 .widget-area { border: 0 !important; }
.with_aside.aside_both .sidebar-2 .widget-area { border: 0 !important; }

After upgrading template to version 21.5.7, custom CSS codes don't work anymore. Please help.

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