*{
    margin:0;
}
html, body {
    font-family: tahoma, sans-serif;
}
.container {
    max-width: 1440px;
    width: 65%;
    margin:0 auto;
}
.site-header{
    text-align: center;
}
nav ul {
    list-style-type: none;
 
    

}
.main {
    padding:20px;
}
.main::after{
    content: "";
    width: 100%;
    display:block;
    clear:both;
}
.sidebar{
    width:18%;
    float:left;
    margin-right:2%;
}
article {
    width:72%;
    float:left;
    margin-right: 2%;
    
}
h1, h2 {
    line-height: 40px;
}
article img {
    width: 300px;
    display:block;
    margin: 10px auto;
}
p {
    font-size: 13px;
    line-height: 15px;
    margin-bottom: 20px
}
a {
    color: #202020;
    font-weight: 500;
}
.pic4{
    width:500px;
}