* {
	box-sizing: border-box;
}
body {
	width: 1200px;
	margin: auto;
	font-family: Arial;
	font-size: 0.875em;
	padding: 0px;
    color: #666;
    background-image: url("/img/22.jpeg");
}
/* 页眉/Blog 标题 */
.header {
  padding: 60px;
  text-align: center;

  background-image: url("/img/1.png");
}
/* 设置上导航栏的样式 */
.topnav {
  overflow: hidden;
  background-color: #edf9f1;

}
/* 设置 topnav 链接的样式 */
.topnav a {
  color: #666;
  float: left;
  display: block;
  text-align: center;
  padding: 10px 12px;
  text-decoration: none;
}
/* 改变鼠标悬停时的颜色 */
.topnav a:hover {
  background-color: #ddd;
  color: black;
}
.serBut {
  float: right;
  top: 0;
  right: 0;
  color: #666;
  background: #7BA7AB;
  border-radius: 0 5px 5px 0;
}
.serInput {
  border: 2px solid #7BA7AB;
  border-radius: 5px;
  background: #F9F0DA;
  color: #9E9C9C;
  height: 25px;
}
/* 创建两个不相等的彼此并排的浮动列 */
/* 左列 */
.leftcolumn {
  float: left;
  background-color: #fff;
  width: 50%;
}
/* 右列 */
.rightcolumn {
  float: left;
  width: 50%;
  background-color: #fff;
  padding-left: 20px;
}
/* 为文章添加卡片效果 */
.card {
  background-color: #fbfbfb;
  padding: 20px;
  margin-top: 20px;
}

/* 清除列之后的浮动 */
.row:after {
  content: "";
  display: table;
  clear: both;
}
.footnav {
  padding: 12px;
  text-align: center;
  margin-top: 20px;
  overflow: hidden;
  background-color: #e7ebe8;
}

.footnav a {


  color: #333;
  text-align: center;
  padding: 10px 12px;
  text-decoration: none;
}
.footnav a:hover {
  background-color: #ddd;
  color: #641616;
}

/* 页脚 */
.footer {
  padding: 20px;
  text-align: center;
  background: #edf9f1;

}
a.topcs:link {

  color: #000000;
  text-decoration: none;
}
a.topcs:visited {

  color: #000000;
  text-decoration: none;
}
a.topcs:hover {

  color: #7d7474;
  text-decoration: none;
}
a.news:link {
  font-size: 0.875em;
  color: #000000;
  text-decoration: none;
}
a.news:visited {
  font-size: 0.875em;
  color: #000000;
  text-decoration: none;
}
a.news:hover {
  font-size: 0.875em;
  color: #FF0000;
  text-decoration: none;
}

/* 响应式布局 - 当屏幕的宽度小于 800 像素时，使两列堆叠而不是并排 */
@media screen and (max-width: 800px) {
  .leftcolumn, .rightcolumn {
    width: 100%;
    padding: 0;
  }
}

/* 响应式布局 - 当屏幕的宽度小于 400 像素时，使导航链接堆叠而不是并排 */
@media screen and (max-width: 400px) {
  .topnav a {
    float: none;
    width: 100%;
  }
}