body{
    background-color:white;
    color: black;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    text-align: justify;
    margin: 20px 400px 20px 400px;
}

h1{
    color: green;
    border: 1px solid green;
    padding: 10px;
    text-align: center;
    margin-right: 50px;
    margin-left: 50px;
}

strong{
    color: goldenrod;
}

span{
    color: darkmagenta;
}

.principal a{
    color: brown;
    text-decoration: underline;
}

.principal li{
    display: inline-block;
    line-height: 2.5;
    margin: 0 89px;
}

img{
    width: 100%;
}

h2{
    text-align: center;
    margin-right: 50px;
    margin-left: 50px;
}

a{
    text-align: center;
}

ul{
    text-align: center;
    list-style: none;
}

button{
    background: green;
    border: 1px solid transparent;
    padding: 2px 20px;
    border-radius: 8px;
}

footer{
    text-align: center;
    font-size: 13px;
}

h4{
    text-align: center;
}

form {
    text-align: center;
}

section ul li{
    font-style: italic;
}