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The first cell contains:

%auto
html("""
<style>
.bigpink {
    color: pink;
    font-size: 50px;
    font-weight: bold;
    background: green;
    padding: 30px;
    text-align: center;
}
</style>
""")

and get rid of the hide=False in the second cell.

html("<div class='bigpink'>I am Big and Pink</div>", hide=False)
I am Big and Pink