@charset "UTF-8";/* お決まり */
/* ◆◆◆◆◆◆◆◆◆◆◆◆◆ 全体（共通） ◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆◆ */
html{font-size: 100%;height: 100%;}
body{
    font-family: "Helvetica Neue", "Arial", "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans", "Meiryo", sans-serif;
    color: #111;
    height: 100%;
    width: 90%;
    max-width: 700px;
    margin: 0 auto;
}
a{
    text-decoration: none;
}
.goback{
    margin: 1rem 0;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    
}
.goback > a{
    display: block;
    padding: 0.5rem 1rem;
    background-color: #000;
    font-size: 0.7rem;
    border-radius: 1.5rem;
    color: #fff;
}
.goback > .firstgoback{
    background-color: #fff;
    color: #fff;
}
h2{
    font-size: 2rem;
    margin: 2rem 0rem 1rem 0rem;
}
h4{
    font-size: 1.4rem;
    margin: 2rem 0 0.2rem 0;
}
p{
    line-height: 170%;
    margin-bottom: 1rem;
}
ul{
    margin: 0 0 1rem 2rem ;
    line-height: 170%;
}
.math_scroll{
    overflow-x: auto;
}
.formula{
    border: solid 1px;
    position: relative;
    padding: 20px 10px;
    margin: 1.5rem 0rem 1rem 0rem;
}
.formula_title{
    position: absolute;
    top: 0;
    left: 10px;
    transform: translate(0, -50%);
    background-color: white;
    padding: 0 10px;
    font-weight: bold;
    font-size: 1.1rem;
}
.example{
    background-color: #f5f5f5;
    padding: 1rem;
    margin: 1rem 0rem 1rem 0rem;
}
.example_title{
    font-weight: bold;
    font-size: 1.1rem;
}

@media(max-width:520px){
    html{font-size: 1rem;}
}