* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
}

header {
    background-color: #ff4444;
    color: white;
    padding: 10px 20px;
    text-align: center;
}

nav ul {
    list-style-type: none;
    background-color: #333;
    text-align: center;
    padding: 0;
}

nav ul li {
    display: inline-block;
    position: relative;
}

nav ul li a {
    text-decoration: none;
    color: white;
    padding: 15px 20px;
    display: inline-block;
}

nav ul li a:hover,
nav ul li:hover > a {
    background-color: #555;
}

nav ul li ul.dropdown {
    display: none;
    position: absolute;
    background-color: #333;
    padding: 0;
    margin-top: 5px;
    border: none;
    z-index: 1000;
}

nav ul li:hover ul.dropdown {
    display: block;
}

nav ul li ul.dropdown li {
    display: block;
}

section {
    margin: 20px;
    padding: 20px;
    background-color: #f4f4f4;
}

footer {
    text-align: center;
    padding: 10px 20px;
    background-color: #222;
    color: white;
}

@media (max-width: 600px) {
    nav ul li {
        display: block;
    }
    nav ul li ul.dropdown {
        width: 100%;
    }
}


.iframe-responsive iframe{width:100%!important;}

@media screen and (max-width:960px){

.iframe-responsive iframe{max-height:90%}}

@media screen and (max-width:768px){

.iframe-responsive iframe{max-height:75%}}

@media screen and (max-width:600px){

.iframe-responsive iframe{max-height:60%}}

@media screen and (max-width:480px){

.iframe-responsive iframe{height:auto!important;max-height:auto!important}}