/*设置根元素的样式，包括字体、背景颜色*/
html
{
    height: 100%;
    font-size: 14px;
    font-family:
        "Open Sans", sans-serif;
}

body {
    height:100%;
}

h1
{
    font-size: 60px;
    text-align: center;
    margin: 0;
    padding: 20px 0;
    color: #00539f;
    text-shadow: 3px 2px 1px black;
}

p,
li
{
    font-size: 16px;
    line-height: 1;
    letter-spacing: 1px;
}

/*图像*/
img
{
    display: block;
    margin: 0 auto;
    border:5px solid black;
}

/*分割线*/
hr
{
    border: none;
    height: 4px;
    background-color: black;
    width: 70%;
}

/*超链接*/
a:link
{
    color: blue;
    text-decoration: none;
}

a:hover
{
    color: green;
    text-decoration: none;
}

.link
{
    text-align: center;
    font-size: 25px;
}

/*左中右三区块*/
.grid-layout
{
    border: 4px solid #000;
    display: grid;
    grid-template-columns: 1fr 800px 1fr;
}

.grid-layout .left
{
    border: 4px solid #000;
    background: #00539f;
}

.grid-layout .middle
{
    border: 4px solid #000;
    background: #ff9500;
}

.grid-layout .right
{
    border: 4px solid #000;
    background: #00539f;
}