html {
    height:100%;
    font-size:17px;
}

body{
    margin:0;
    color:#333;
    font-family:"Noto Sans JP", system-ui, -apple-system, "Hiragino Sans", "Yu Gothic UI", sans-serif;
    line-height:1.9;
}

a { color: #607971; }

header {
    margin: 40px 0 30px 0;
    text-align: center;
    img { height: 60px;}
}

main {
    text-align: center;
}

section {
    margin: 0 0 40px 0;
}

.topimg img {
    height: 200px;
    border: 12px #f5f5f5 solid;
    border-radius: 6px;
}
h2 {
    margin: 0 0 5px 0;
    font-size: 1rem;
}
p {
    margin: 0 20% 20px 20%;
    font-size: 1rem;
}

.update p {
    font-size: 0.8rem;
    line-height: 1.5;
    color: #999;
}

.sns img {
    height: 30px
}

.sns {
    a {
        margin: 0 8px;
        text-decoration: none;
    }
}

footer {
    padding: 0 0 10px 0;
    text-align: center;
    font-size: 0.8rem;
    color: #999;
}

@media (max-width: 720px) {
  main {
      margin: 0 20px;
      text-align: left;
    }
    
    .topimg {
        text-align: center;
            img {
                width: 100%;
                border: none;
                height: auto;
        }
    }
    p {
        margin: 0 10px 20px 10px;
        line-height: 1.7;
    }
    
    .sns {
        text-align: center;
    }
    
    .update {
        text-align: center;
    }
    
    footer {
        margin: 0 20px;
    }
}