body{
font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue",Arial;
padding:20px;
background:#f7f7f7;
line-height:1.6;
color:#333;
}

.card{
max-width:700px;
margin:0 auto;
background:#fff;
padding:18px;
border-radius:10px;
}

/* 段落系统 */

p{
margin:0;
margin-top:10px;
}

.small{
margin-top:6px;
line-height:1.6;
}

h1{
margin-top:0;
}

h3{
margin-top:22px;
}

a{
color:#0f2a44;
text-decoration:none;
}
.img-content{
      width:100%;
      max-width:600px;
      display:block;
      margin:16px auto;
      border-radius:6px;
    }
    img {
  max-width: 700px;
  height: auto;
}
h2 {
  margin: 16px 0 8px;
}

h3 {
  margin: 14px 0 6px;
}

h4 {
  margin: 10px 0 1px;
}
.link {
  text-decoration: underline;
}