Trilium/apps/client/src/widgets/note_icon.css

.note-icon-widget {
    padding-inline-start: 7px;
    margin-inline-end: 0;
    width: 50px;
    height: 50px;
}

.note-icon-widget button.note-icon {
    font-size: 180%;
    background-color: transparent;
    border: 1px solid transparent;
    padding: 6px;
    cursor: pointer;
    color: var(--muted-text-color);
}
    
.note-icon-widget button.note-icon:disabled {
    cursor: default;
    opacity: .75;
}

.note-icon-widget .dropdown-menu {
    border-radius: 10px;
    border-width: 2px;
    box-shadow: 10px 10px 93px -25px black;
    padding: 10px 15px 10px 15px !important;
}

.note-icon-widget .filter-row {
    padding-top: 10px;
    padding-bottom: 10px;
    padding-inline-end: 20px;
    display: flex;
    align-items: baseline;
}

.note-icon-widget .filter-row span {
    display: block;
    padding-inline-start: 15px;
    padding-inline-end: 15px;
    font-weight: bold;
}

.note-icon-widget .icon-list {
    height: 500px;
    overflow: auto;
}

.note-icon-widget .icon-list span {
    display: inline-block;
    padding: 10px;
    cursor: pointer;
    border: 1px solid transparent;
    font-size: 180%;
}

.note-icon-widget .icon-list span:hover {
    border: 1px solid var(--main-border-color);
}