html {
    margin: 0;
}

*, *:before, *:after {
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    overflow-x: hidden;
    overscroll-behavior-x: hidden;
}

header {
    background-color: black;
    color: white;
    text-align: center;
    padding: 1em;
}

header a {
    text-decoration: none;
    color: inherit;
    border-bottom: 2px solid transparent; 
    transition: border-bottom 0.3s ease; 
}

header a:hover {
    border-bottom: 2px solid white; 
}

.content {
    animation: hu__hu__ infinite 2s ease-in-out;
    padding: 5px;
    text-align: center;
    padding-bottom: 0%;
}

@keyframes hu__hu__ {
    50% {
        transform: translateY(10px);
    }
}


.popup a {
    text-decoration: none; 
    color: black;
}

.section {
    text-align: center;
    margin-top: 20px;
    overflow: hidden;
}

.heading {
    text-align: center;
    padding-top: 1em;
    letter-spacing: 2px;
}

.heading h2 {
    font-size: 24px;
    color: #333;
}

.contact-email {
    font-family: 'Open Sans', 'Helvetica Neue', sans-serif;
    letter-spacing: 2px;
    font-size: medium;
    padding-top: 2px;
}

.line {
    height: 1px;
    width: 200px;
    background: black;
    box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
    margin: 20px auto;
}

.content-text {
    text-align: center;
}

.download-container {
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn {
    background-color: rgb(0, 0, 0);
    color: #fff;
    border: none;
    padding: 8px 20px;
    font-size: 18px;
    border-radius: 10px;
    margin-left: 10px;
    box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
}

.btn:hover {
    background-color: whitesmoke;
    color: rgb(0, 0, 0);
    border-style: groove;
    border-color: black;
}

.video-container {
    display: flex;
    gap: 20px;
    margin-top: 20px;
    margin-left: 30px;
    margin-right: 30px;
    padding: 20px;
    overflow-x: auto;
    align-items: center;
    justify-content: first baseline;
}

.video-iframe {
    width: 300px;
    height: 170px;
}

footer {
    background-color: black;
    color: white;
    text-align: center;
    align-content: center;
    padding: 1em;
    width: 100%;
    clear: both;
    margin-top: 50px;
}