*,
*::before,
*::after{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Helvetica Neue,Hiragino Kaku Gothic ProN,"メイリオ",meiryo,sans-serif;
}

body{
    background-color: #777777;
}

a,
a:visited{
    color: #0000ff;
    font-weight: bold;
    text-decoration: none;
}
.page_back:hover{
    text-decoration: underline;
}

#main{
    width: 95%;
    /* width: min(90%, 1500px); */
    margin: 20px auto;
}

#main > table{
    background-color: azure;
    border-collapse: collapse;
    width: 100%;
}

#main > table th,
#main > table td{
    border: 3px solid #777777;
    border-collapse: collapse;
    padding: 5px;
}
#main > table td{
    vertical-align: top;
}


#main > table table{
    border-collapse: collapse;
    margin-top: 10px;
    margin-bottom: 10px;
}

#main > table table th,
#main > table table td{
    border: 2px solid #777777;
    padding: 3px;

}



.python{
    background-color: #3572A522;
}
.javascript{
    background-color: #f1e05a22;
}
.php{
    background-color: #4F5D9522;
}

#sticky{
    position: sticky;
    top: 0;
}

pre {
    padding: 3px;
    border: solid 1px #4d4d4d;
    background-color: #25292f;
    color: #ffffff;
    }

pre .blue_01{
    color: rgb(0, 228, 228);
}
pre .blue_02{
    color: rgb(0, 174, 255);
}

@media screen and (max-width:670px) {
    *{
        font-size: 13px;
    }
}