* {
    box-sizing: border-box;
}

body,
h1,
h2,
#ad,
#introduction,
#more,
p {
    background-color: rgb(7, 7, 7);
    /*background-color: rgb(143, 169, 184);*/
}

body,
h1,
h2,
p,
#introduction,
#introduction ul li a:visited,
#more,
a:link,
a:visited {
    color: rgb(240, 241, 224);
    /* color: rgb(7, 7, 7); */
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

header {
    width: 100%;
    height: 50px;
    background-image: linear-gradient(black, rgb(190, 187, 0));
}

.plate {
    border: 2px solid rgba(255, 251, 0, 0.89);
    height: 360px;
}

a {
    text-decoration: none;
}

header a {
    width: 20%;
    height: 50px;
    display: inline-block;
    float: left;
    background-color: rgba(251, 255, 0, 0.589);
    color: rgb(240, 241, 224);
    text-align: center;
    line-height: 50px;
    /* border: 1px solid yellow; */
    margin: 0;
}

header a:active,
#aHighLight {
    background-color: rgba(180, 180, 0, 0.799);
}

header a:hover {
    background-color: rgba(255, 252, 0, 0.799);
}

h1 {
    text-align: left;
}

p {
    text-indent: 2em;
    margin-top: 0%;
    margin-bottom: 0%;
    width: 100%;
    line-height: 30px;
}

.row:after {
    content: "";
    clear: both;
    display: table;
}

[class*="col-"] {
    float: left;
    padding: 15px;
}

.col-1 {
    width: 8.33%;
}

.col-2 {
    width: 16.66%;
}

.col-3 {
    width: 25%;
}

.col-4 {
    width: 33.33%;
}

.col-5 {
    width: 41.66%;
}

.col-6 {
    width: 50%;
}

.col-7 {
    width: 58.33%;
}

.col-8 {
    width: 66.66%;
}

.col-9 {
    width: 75%;
}

.col-10 {
    width: 83.33%;
}

.col-11 {
    width: 91.66%;
}

.col-12 {
    width: 100%;
}

@media only screen and (min-width: 768px) {
    /* 针对电脑 */
}

@media only screen and (max-width: 768px) {
    /* 针对手机： */
    [class*="col-"] {
        width: 100%;
    }
}