thaw/src/select/select.css

.thaw-select {
    position: relative;
    padding: 0 10px;
    height: 30px;
    line-height: 30px;
    background-color: var(--thaw-background-color);
    color: var(--thaw-font-color);
    border: 1px solid var(--thaw-border-color);
    border-radius: 3px;
    transition: all 0.3s;
    cursor: pointer;
    box-sizing: border-box;
}

.thaw-select:hover {
    border-color: var(--thaw-border-color-hover);
}

.thaw-select-menu {
    color: var(--thaw-font-color);
    background-color: var(--thaw-background-color);
    box-sizing: border-box;
    padding: 5px;
    width: 100%;
    max-height: 200px;
    border-radius: 3px;
    box-shadow: 0 3px 6px -4px rgba(0, 0, 0, 0.12),
        0 6px 16px 0 rgba(0, 0, 0, 0.08), 0 9px 28px 8px rgba(0, 0, 0, 0.05);
    overflow: auto;
}

.thaw-select-menu__item {
    padding: 6px 5px;
    border-radius: 2px;
    cursor: pointer;
}

.thaw-select-menu__item:hover {
    background-color: var(--thaw-background-color-hover);
}

.thaw-select-menu__item-selected {
    color: var(--thaw-font-color-selected);
}