*{

box-sizing:border-box;

}



body{


margin:0;

font-family:

"Microsoft YaHei",
Arial,
sans-serif;


background:#f5f5f5;


color:#222;


}



header{


background:white;


padding:25px;


text-align:center;


}



header h1{


margin:0;


font-size:32px;


}



nav{


padding:15px;

text-align:center;


}



button{


padding:8px 18px;

margin:5px;

border:0;

border-radius:20px;

background:white;

cursor:pointer;


}



main{


max-width:900px;

margin:auto;


}



article{


background:white;


margin:15px;


padding:20px;


border-radius:10px;


}



article h2{


font-size:20px;


}



article a{


color:#222;

text-decoration:none;


}



.info{


color:#888;

font-size:14px;


}



article p{


line-height:1.6;


}