.body {
    margin: auto;
    width: 800px;
    font-family: Helvetica, Arial, sans-serif;
    line-height: 140%;
}

.introduction {
    max-width: 800px;
}

#top {
    text-align: center;
}

ul {
    list-style-type: none;
    margin-bottom: 15px;
    padding-inline-start: 0px;
}

li {
    list-style-type: none;
    margin-bottom: 5px;
}

img {
    width: 300px;
}

.completed {
    margin-bottom: 20px;
}

.details {
    max-width: 800px;
    clear: both;
}

.topbottom {
    margin-top: 20px;
    margin-bottom: 50px;
}

.leftside {
    float: left;
}

.rightside {
    float: right;
    padding-top: 20px;
}

.rightside li {
    text-align: right;
}


@media only screen and (max-width: 800px) {
    .body {
        margin: auto;
        width: 300px;
    } 

    ul {
        padding: 0;
    }

    .mainul {
        padding-bottom: 50px;
    }

    img {
        width: 300px;
    }

    .details {
        max-width: 300px;
    }

    .leftside {
        float: none;
    }
    
    .rightside {
        float: none;
        padding-top: 20px;
    }
    
    .rightside li {
        text-align: left;
    }
    
}