You could use the following custom CSS, for:
1) TRANSPARENT background color:
.recent-post figure, .wpb_box_text.coloured .box-content-wrap, span.highlighted, span.dropcap4, #respond .form-submit input, .loved-item:hover .loved-count, .flickr-widget li, #header-language-flags .current-language, .wpcf7 input.wpcf7-submit[type="submit"] {
background-color: transparent !important;
}
or 2) WHITE
.recent-post figure, .wpb_box_text.coloured .box-content-wrap, span.highlighted, span.dropcap4, #respond .form-submit input, .loved-item:hover .loved-count, .flickr-widget li, #header-language-flags .current-language, .wpcf7 input.wpcf7-submit[type="submit"] {
background-color: #FFF !important;
}
Regards,
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Cosmin – Support