pxt-core/react-common/styles/controls/Dropdown.less

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.common-dropdown {
    position: relative;
    width: fit-content;
}

.common-dropdown > .common-button {
    display: block;
    box-sizing: border-box;

    color: var(--pxt-neutral-foreground1);
    background-color: var(--pxt-neutral-background1);
    border: 1px solid var(--pxt-neutral-stencil1);

    min-width: 10rem;
    border-radius: 2px;
    padding: 0px 28px 0px 8px;
    margin: 0px;
    height: 32px;
    line-height: 30px;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    text-align: left;

    & > .common-button-flex > i.right {
        position: absolute;
        right: 0
    }

    &:focus::after {
        outline: none;
    }

    &:focus {
        border: 1px solid var(--pxt-focus-border);
    }
}

.common-dropdown .common-button > .common-button-flex > i:first-child {
    margin-right: 0.5rem;
}

.common-dropdown > .common-menu-dropdown-pane {
    width: unset;
    right: unset;
    min-width: 100%;
    left: 0;
    z-index: 1;

    li .common-button {
        text-align: left;
        width: 100%;
        padding-left: 0.5rem;
    }
}

.common-dropdown.hang-left > .common-menu-dropdown-pane {
    left: unset;
    right: 0;
}

.common-dropdown-shadow {
    box-shadow: 0 3.2px 7.2px 0 rgb(0 0 0 ~"/ 13%"), 0 0.6px 1.8px 0 rgb(0 0 0 ~"/ 11%");
}

.common-dropdown.icon-preview > .common-button {
    min-width: unset;

    .common-button-label {
        display: none;
    }
}