minio/browser/app/less/inc/dropdown.less

.dropdown,
.dropup {
    position: relative;
}

.dropdown-toggle--icon {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    line-height: 100%;
    background-color: transparent;

    & > .zmdi {
        font-size: 1.25rem;
        line-height: 1.1rem;
    }

    &:hover {
        background-color: @white;
    }
}

.dropdown-menu {
    position: absolute;
    top: 0;
    left: 0;
    z-index: @zindex-dropdown;
    border: 1px solid @dropdown-border-color;
    display: none;
    padding: 0.75rem 0;
    margin: 0;
    list-style: none;
    font-size: @font-size-base;
    background-color: @dropdown-bg;
    border-radius: @border-radius-large;
    box-shadow: @dropdown-shadow;
    min-width: 5rem;

    > li > a {
        display: block;
        color: @dropdown-link-color;
        padding: 0.5rem 1.25rem;
        font-size: @font-size-base - 1;
        white-space: nowrap;
        .transition(all);
        .transition-duration(300ms);

        &:hover {
            color: @dropdown-link-hover-color;
            background-color: @dropdown-link-hover-bg;
        }

        & > i {
            text-align: center;
            width: 1.1rem;
            margin-left: 0.75rem;
            font-size: 1.15rem;
            vertical-align: top;
            position: relative;
            top: 0.05rem;
            line-height: 100%;
        }
    }
}

.open {
    & > .dropdown-menu {
        display: block;
    }
}

.dropdown-menu-right {
    right: -0.1rem;
    left: auto;

    & > li {
        & > a {
            text-align: right;
        }
    }
}