@keyframes color{
    0% {background-color: aquamarine;}
    25% {background-color: yellow;}
    50% {background-color: red;}
    75% {background-color: azure}
}

body{
        box-shadow: 0 0 10px black;
        animation-name: color;
        animation-duration: 6s;
        animation-iteration-count: infinite; 
}

h1 {
    color: green;
    margin: auto;
    padding: 10px;
    border-style: solid;
    border-color: black;
    border-radius: 5px;
    border-width: 2px;
}

nav {
    margin: auto;
    border-style: solid;
    border-color: black;
    border-radius: 5px;
    border-width: 2px;
    padding: 5px;
}

nav a {
    color: green;
    margin: auto;
    text-decoration: underline;
}

form {
    color: black;
    margin: auto;
}

.form {
    color: green;
    margin: auto;
    padding: 10px;
    border-style: solid;
    border-color: black;
    border-radius: 5px;
    border-width: 2px;
}

table {
    color: green;
    margin: auto;
    padding: 10px;
    border-style: solid;
    border-color: black;
    border-width: 2px;
}

.question {
    color: green;
    margin: auto;
    padding: 10px;
    border-style: solid;
    border-color: black;
    border-radius: 5px;
    border-width: 2px;
}

.radio {
    margin: auto;
}

input[type="submit"] {
    background-color: white;
    color: black;
    display: inline-block;
    border-style: solid;
    border-color: black;
    border-width: 2px;
}

p {
    color: black;
    margin: auto;
    padding: 10px;
    border-style: solid;
    border-color: black;
    border-radius: 5px;
    border-width: 2px;
}

p a {
    color: green;
    text-decoration: underline;
}