/*  JavaScript 7th Edition
    Chapter 8
    Hands-on Project 8-2

    Filename: styles.css
*/

/* apply a natural box layout model to all elements */
* {
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
}

/* reset rules */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}

/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
    display: block;
}

body {
    line-height: 1;
    width: 960px;
    background: white;
    margin: 0 auto;
    font-family: Verdana, Geneva, sans-serif;
}

ol, ul {
    list-style: none;
}

/* page header */
header {
    background: #5472B2;
    width: 100%;
    color: #FFFFFF;
    font-size: 48px;
    text-align: center;
    line-height: 1.5em;
    margin-bottom: 0;
}



/*-------------------- Project Styles ------------------*/

section {
    background-color: #FFDB70;
    margin-top: 0;
    padding-bottom: 20px;
    user-select:none;
    height: 570px;
    position: relative;
}

section h1 {
    font-size: 2.8em;
    text-align: center;
    margin: 0;
    padding: 20px 0;
}

div#box {
    width: 800px;
    height: 400px;
    border: 0px solid rgba(120, 120, 120, 0.5);
    background-color: ivory;
    position: relative;
    margin: 10px auto;
    top: 0px;
    left: 0px;
    box-shadow: 5px 5px 10px gray;
}

div.ball {
    position: absolute;
    background:radial-gradient(closest-corner at 25% 25%, rgba(92, 151, 170, 0.1) 0, rgba(92, 151, 170, 0.5) 100%);
    border: 1px solid transparent;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    cursor: pointer;
}


input#addBall {
    display: block;
    width: 120px;
    height: 30px;
    margin: 25px auto;
    font-size: 1.2em;
    cursor: pointer;
}