body{
    margin: 0px;
}


h1{
    text-align: center;
    color: darkblue;
    margin-bottom: 20px;
}

h3{
    margin:0px;
}

p{
    margin: 0px;
}

main{
    background-color: cadetblue;
    padding:25px;
    margin-bottom: 5px;
}

footer{
    margin-bottom: 50px;
}

table{
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 20px;
}

table, td, th{
    border-style: solid;
    border-width: 3px;
    padding: 0px;
    border-color: darkgreen;
    border-collapse: collapse;
    color: white;
    font-size: 120%;
    font-weight: bold;
}

td, th{
    padding: 5px;
}


input{
    width:100px;
    height: 30px;
    font-size: 80%;
    padding-left: 3px;
    background-color: aqua;
}



button{
    width:100px;
    height: 50px;
}

#a2 p{
    background-color: palevioletred;
    padding:5px;
    margin:0px;
    font-weight: bold;

}

span{
    color: darkred;
}

#wrapper{
   width: 99%;
   margin: auto;
   min-width: 1200px;
}


#css_code{

    float: left;
    font-size: 120%;
    margin: 10px;
    color: darkblue;
}

#tables{
   /*margin-left: 220px;*/
    margin-left: auto;
    margin-right: auto;
    width: 800px;
}

#button_container, #button_container td{
    border-style: hidden;

}

#button_container{
    margin-bottom: 20px;
}

#colours_table{
    margin-left: 50px;
    margin-top: 20px;
    border-color: navy;
    border-collapse: collapse;
}

#colours_table td{
    border-color: navy;
    color: navy;
}

#colours_table th{
    border-color: navy;
    color: navy;

}

.colour_cell{
    margin: 5px;
    padding:20px;
    width:200px;

}

#child_bgr{  
    background-color: greenyellow;
}

#parent_bgr{
    background-color: yellow;
}

#child_content{  
    background-color: palevioletred;
}

#parent_content{
    background-color: darkgray;
}

#child_border{  
    background-color: blue;
}

#parent_border{
    background-color: red;
}

#a1{
    width:700px;
    background-color: yellow;
    padding:0px;
    margin-left: auto;
    margin-right: auto;
    border-style: solid;
    border-width: 3px;
    border-color: red;  
    text-align: center;
}


#a1 h2{
    padding: 0px;
    margin: 0px;
    text-decoration-line: underline;
    color: indigo;
    text-decoration-color: indigo;
    background-color: darkgrey;
    display: inline-block;
    margin-top: 0px;
    margin-bottom: 0;


}

#a2{

    background-color: greenyellow;
    margin-left: 25px;
    margin-right: 25px;
    margin-top: 25px;
    margin-bottom:25px;
    padding:25px;
    border-style: solid;
    border-width: 3px;
    border-color: blue;
    text-align: center;
}