@import url( https://fonts.googleapis.com/css?family=Open+Sans:300 );

*, *:before, *:after {
    -webkit-box-sizing: inherit;
    -moz-box-sizing: inherit;
    box-sizing: inherit;
}

html {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: "Open sans", tahoma;
    color: #333;
    counter-reset: ex-count;
}

.oh { overflow: hidden; }

.cont {
    margin: auto;
    width: 960px;
}

header, footer {
    padding: 80px 0;
    background: #f8f8f8;
    border-bottom: 1px solid #e9e9e9;
}

footer {
    margin-top: 100px;
    border-bottom: none;
    padding: 40px 0;
    border-top: 1px solid #e9e9e9;
}

    footer a, footer span {
        color: #999;
        text-decoration: none;
    }

    footer span {
        float: right;
    }

    footer a + a {
        margin-left: 40px;
    }

    footer a:hover, footer a:focus {
        color: #666;
    }

h1 {
    text-align: center;
    font-weight: normal;
    margin: 0;
}

h2 {
    font-weight: normal;
    font-size: 28px;
    counter-increment: ex-count;
    margin-top: 50px;
}
h2:before {
    content: counter( ex-count ) '.';
    padding-right: 10px;
    font-size: 18px;
    color: #999;
}

.ex {
    border: 1px solid #e9e9e9;
    background: #f8f8f8;
    text-align: center;
    padding: 40px;
}
.ex.half {
    width: 47%;
    float: left;
}
    .ex span {
        padding: 10px;
        background: #5A2C81;
        color: #fff;
        border-radius: 3px;
    }

.ex.half + * {
    float: right;
    width: 50%;
    margin-left: 3%;
    display: block;
}

.ex.half + code {
    padding: 30px 15px 50px;
    font-size: 16px;
    line-height: 1.8;
    background: #333;
    white-space: nowrap;
    overflow: auto;
    height: 105px;
    color: #fff;
}

code .note {
    color: #ffc77e;
}

input {
    border: 1px solid #ccc;
    padding: 8px 12px;
    font-size: 16px;
    width: 100%;
    margin-top: 30px;
}

.man .ex + div {
    text-align: center;
}

button {
    background: #f9f9f9;
    border: 1px solid #ccc;
    color: #666;
    font-size: 18px;
    padding: 10px 15px;
    margin-left: 5px;
    margin-top: 20px;
    cursor: pointer;
    font-family: "Open sans";
}