How to allow a user to choose their background color

Using the code below allows visitors to hover their mouse pointer over any of the letters in "Choose your background" to change the colors of the web page's background.

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<a href="" onmouseover="document.bgColor='turquoise'">C</a>
<a href="" onmouseover="document.bgColor='pink'">h</a>
<a href="" onmouseover="document.bgColor='blue'">o</a>
<a href="" onmouseover="document.bgColor='red'">o</a>
<a href="" onmouseover="document.bgColor='yellow'">s</a>
<a href="" onmouseover="document.bgColor='green'">e</a>
<a href="" onmouseover="document.bgColor='white'">your</a>
<a href="" onmouseover="document.bgColor='green'">o</a>
<a href="" onmouseover="document.bgColor='seagreen'">w</a>
<a href="" onmouseover="document.bgColor='magenta'">n</a>
<a href="" onmouseover="document.bgColor='fusia'">b</a>
<a href="" onmouseover="document.bgColor='purple'">a</a>
<a href="" onmouseover="document.bgColor='navy'">c</a>
<a href="" onmouseover="document.bgColor='royalblue'">k</a>
<a href="" onmouseover="document.bgColor='Skyblue'">g</a>
<a href="" onmouseover="document.bgColor='brown'">r</a>
<a href="" onmouseover="document.bgColor='almond'">o</a>
<a href="" onmouseover="document.bgColor='coral'">u</a>
<a href="" onmouseover="document.bgColor='olivedrab'">n</a>
<a href="" onmouseover="document.bgColor='teal'">d</a>
<a href="" onmouseover="document.bgColor='black'">color!</a>
</center>