index.html

body{
    font-family: Arial, Verdana;
    background: #000000;
    color: #ffffff;
    margin-top: 20px;
    margin-left: 20px;
    margin-right: 20px;
}

h1{
    font-size: 42px;
    padding: 15px;
    text-align: center;
}

h2{
    font-size: 30px;
    color: #0D0D0D;
}

p{
    font-size: 24px;
    padding-left: 10px;
    padding-top: 10px;
}

img{
    width: 250px;
    display: block;
    margin: auto;
    border: 10px dashed #ffffff;
}

div{
    height: auto;
    min-height: 125px;
    padding: 20px;
    border: 3px solid #ffffff;
}

.introduction{
    border-radius: 15px;
    margin-top: 15px;
    line-height: 200%;
    border-style: solid;
}

.red{
    background: #ff0000;
    text-align: right;
    margin-left: 50px;
    border-left: 5px solid;
    border-bottom: 2px solid;
}

.blue{
    background: #0000ff;
    text-align: left;
    margin-right:  50px;
    border-right: 5px solid;
    border-top: 2px solid;
}

.blue h2, .blue p{
    color:#C4C4C4;
}

.yellow{
    background: #FFFF00;
    text-align: right;
    margin-left: 50px;
    border-bottom: 2px solid;
    border-left: 5px solid;
}

.yellow p{
    color: #707070;
}

.green{
    background: #00EB00;
    text-align: left;
    margin-right: 50px;
    border-right:5px solid;
    border-top: 2px solid;
}

footer{
    background: rgb(2, 0, 36);
    background: linear-gradient(90deg, rgba(2, 0, 36, 1) 0%, rgba(0, 0, 255, 1) 25%, rgba(0, 102, 255, 1) 70%, rgba(0, 0, 0, 1) 100%);
    border: 5px solid #ffffff;
}

footer p{
    font-size: 20px;
    text-align: right;
    padding-top: 15px;
    padding-right: 15px;
    padding-bottom: 15px;
}