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Get into Admin Panel > Appearance > Customize > Additional CSS > Paste the below css code inside the text area > Save All.
ul.time-table li:hover span, ul.time-table li.selected span { color:#FFF !important; background :red !important;}
ul.time-table > li:before { background-color: #FFF;}
ul.time-table li { background-color: red;}
ul.time-table li:hover ul.time-slots li a {background-color: gray;color :#000;}
Note: You can change the colour value as per your need.
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