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HTML5 Web Application Development By Example Beginner's guide by J.M. Gustafson

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Time for action – creating the CSS file

Next we'll create our base CSS file named app.css. This will have all of the basic styling that will be used by our applications, such as the default font and colors. The first part of the CSS file contains some document-wide element styles that set the basic look and feel.

body
{
    font: 1em Verdana, Geneva, sans-serif;
    padding: 0;
    margin: 5px;
    color: Black;
    background-color: WhiteSmoke;
}
div
{
    padding: 0;
    margin: 0;
}
button
{
    cursor: pointer;
}
.hidden
{
    display: none;
}

First we set the style to be applied to the body, which will trickle down to the other elements. I like to set the font size to 1em instead of a fixed pixel size so that it uses the browser's default font size. Then you can base other measurements ...

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