Gnome Switcher stylesheet (Ubuntu 20.04 theme)

stylesheet.css

.switcher-box-layout {
    background-color: #323030;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(24, 28, 32, .8);
    color: #AAA;
    font-family: Ubuntu, sans-serif;
    margin-top: 100px;
    overflow: hidden;
}

StEntry.switcher-entry {
    background-color: #323030;
    border: none;
    border-radius: 0;
    border-top-left-radius: 4px;
    border-top-right-radius: 4px;
    box-shadow: none;
    color: #FFF;
    margin: .6em;
}

.switcher-box {
    border-top: 1px solid #1A1D23;
}

.switcher-box:hover {
    background-color: #3F3C3C;
}

.switcher-box:last-child {
    border-radius: 0 0 4px 4px;
}

.switcher-icon, .switcher-label  {
    padding: .6em;
}

.switcher-label {
    padding-left: 0;
}

.switcher-highlight {
    background-color: #e95420;
    color: #FFF;
}

.switcher-highlight:hover {
    background-color: #e95420;
    color: #FFF;
}

.switcher-shortcut {
    padding-left: .6em;
    padding-right: .6em;
    text-align: center;
}

Old

Install by replacing stylesheet.css in ~/.local/share/gnome-shell/extensions/switcher@landau.fi/ with this one.