.daiji {
    font-size: 21px;
    color: black; 
    margin-left: 30px; 
    margin-top: 30px; 
    margin-bottom: 30px;
}

footer {
    background-color: rgb(10, 10, 10);
    text-align: center;
    vertical-align: bottom;
    font-size: 11px;
    color: rgb(254, 254, 254);
    height: 50px;
}

#topicpath {
    background-color: gainsboro;
}

#main {
    margin-left: 50px;
    margin-right: 50px;
}

@media screen and (max-width: 520px) {

    .daiji {
        font-size: 21px;
        color: black; 
        margin-left: 0px;  
    }
    
}