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One of the goals of the high-contrast themes is to provide clarity for viewers. Shadows on text or other graphics can provide a very nice, subtle 3D effect, but this can be troublesome for some people. When designing styles for high-contrast, it's important to remember to deliberately remove such shadows, as illustrated in the example below.

<button class="idi-prefs-button">preferences</button>

This button uses a white drop shadow on the black text to provide an elegant embossed look:

But such a shadow would be inappropriate for a high contrast theme. In this example (the yellow-on-black theme in this case), the text shadow is removed completely:

.idi-prefs-button {
    color: #000000;
    text-shadow: 1px 1px 0 #FFFFFF;
    background-color: #E5E5E5;
    background-image: url("images/preferences.png");
    background-position: 0.4em 50%;
    background-repeat: no-repeat;
    width: 8em;
}
.fl-theme-yb .idi-prefs-button {
    text-shadow: none;
    border: 1px solid yellow;
    background-image: url("images/preferences-yellow.png");
}
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