body{
background-image: url(1.jpg);
background-size: 100%;
margin: 0;
font-family: Microsoft YaHei
}
 
 p.a{
text-align: center;
font-family: KaiTi;
font-size: 50px;
color: maroon;
 }
 
 p.b{
font-family: Arial;
font-weight: bold;	 
font-size: 30px;
display: block;
text-align: center;
 }


.header {
  background-image: url(background1.jpeg);
  background-size: 100%;
  padding: 1px;
  text-align: center;
  font-size: 30px;
  color:crimson;
}

h2{
font-size:30px;
text-align: center;
color: mediumvioletred;
}

.h3{
font-size:25px;
text-align: center;
color: midnightblue;
}

.topnav {
  width: 100%;
  overflow: hidden;
  background-color: lightsalmon;
}


.topnav a {
  float: left;
  width: 17%;
  color: black;
  text-align: center;
  padding: 12px;
  text-decoration: none;
  font-weight: bold;
  font-size: 18px;
}

.topnav a:hover {
  background-color:light coral;
  color: black;
}


.table, th, td {
  border: 1px navy blue;
  font-weight: bold;
  text-align:left;
  font-size: 25px;
}
  

.leftcolumn {   
  float: left;
  width: 45%;
  margin-left:40px;
}


.rightcolumn {
  float: right;
  width: 45%;
  margin-right:40px;
}

.footer {
  padding: 5px;
  text-align: center;
  background:ivory;
  border: solid black;
  font-family: KaiTi;
  font-size: 25px;
  font-weight: bold;
}


.imagec {
display: block;
margin-left: auto;
margin-right: auto;
padding: 5px;
background-color: tomato;
border: 2px solid black;
height: 550px;
width:400px;}

.imagec2{
display: block;
margin-left: auto;
margin-right: auto;
padding: 2px;
background-color: black;
border: 2px solid black;
height: 300px;
width:400px;
}
.imagec3 {
display: block;
 border-radius: 8px;
margin-left:auto;
margin-right:auto;
height: 330px;
width:500px;
}

.column {
  float: left;
  width: 33.33%;
  padding: 15px;
}

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

.column img {
  margin-top: 12px;
  
}


.row:after {
  content: "";
  display: table;
  clear: both;
  margin-left: auto;
margin-right: auto;
}