*{
    background-color: black;
    color: white;
    line-height: 1.7;
}

.Title1 {
    font-family: Arial;
    font-size: xx-large;
}

.Title2 {
    font-family: Arial;
    font-size: x-large;
}

.Title3 {
    font-family: Calibri;
    font-size: medium;
}

#Title4 {
    font-family: Arial;
    font-size: large;
}



.solar_system {
    width: 100%;
}

.bttn {
    cursor: pointer;
    font-family: Calibri;
}

#basic {
    font-family: Calibri;
    font-size: large;
    text-align: justify;
}

#basic2 {
    font-family: Calibri;
    font-size: large;
}


#myjustify {
    text-align: justify;
}

#mercury {
    width: 80%;
}

.venus {
    width: 80%;
}

#planet {
    width: 80%;
}

#link{
    text-decoration: none;
}

#word {
    text-decoration: underline;
}

#number {
    text-decoration: none;
}