*{
    font-family:Verdana, Geneva, Tahoma, sans-serif;
    color: white;
}
h1{
    text-align: center;
    font-size: 70px;
    padding-bottom: 40px;
}
section{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border: 1px solid #ccc;
    border-radius: 5px;
    margin: 20px;
    padding: 20px;
    text-align: center;
}
p{
    font-size: 1.5em;
}

.main-nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

.main-nav li {
    float: left;
}

.main-nav li a {
    transition-duration: 0.2s;
    display: block;
    color: white;
    text-align: center;
    padding: 14px 40px;
    text-decoration: none;
    font-size: 1.5em;
}
.main-nav li a:hover {
transition-duration: 0.2s;
background-color: #111;
}
.main-nav .active {
    transition-duration: 0.2s;
    background-color: #04AA6D;
}
.main-nav .active:hover {
    transition-duration: 0.2s;
    background-color: #0b6b48;
}

.content {
    width: 100%;
    padding: 0 18px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 2s ease-out;
}

@keyframes head {
    0%{opacity: 0;}
    100%{opacity: 1;}
}

#commas{
    display: none;
    font-size: 0.6em;
}
#commas:after{content: " "}
p:hover #commas{
    display: inline;
    animation-name: head;
    animation-duration: 1s;
    color: silver;
}

@media (max-width: 1000px) {
    iframe{
        height: 300px;
        width: 100%;
    }
}