body
{
    margin: 10px;
    font-family: Arial, Verdana;
    font-size: 14px;
}

div {
    box-sizing: border-box;
}

#divMain {
    position: relative;
    background-color: #ffffff;
    width: 100%;
    height: 100%;
    margin: auto;
    padding: 0px;
}
@media (max-width: 900px) {
    #divMain {
        width: 900px;
    }
}

#divHeader {
    position: relative;
    width: 100%;
    padding: 10px;
    border: 2px solid #3797bb;
    border-radius: 8px;
    background-color: #aed4de;
    text-align: center;
}

p.header {
    margin: 0px;
    padding: 4px;
}

#divContents {
    position: relative;
    width: 100%;
    height: 100px;
    margin-top: 10px;
    padding: 0px;
    border: 2px solid #3797bb;
    border-radius: 8px;
    background-color: #ffffff;
}

#iframeContents {
    width: 100%;
    height: 100%;
    margin: 0px;
    padding: 0px;
    overflow: hidden;
    border: none;
}

#spanSubjects {
    width: 300px;
}

#selectSubjects {
    width: 240px;
}

#selectSections {
    width: 240px;
}

#selectTopicsAndLessons {
    width: 650px;
}

option.topic {
    color: #888888;
}

option.lesson {
    color: #0000ee;
}

#inputLoadLesson {
    width: 82px;
}

#inputLessonID {
    width: 64px;
}