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

body {
    background-color: blue;
font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
font-size: 18px;

}

video {
    width: 100%;
}

input {
    display: block;
    margin-bottom: 10px;
    width: 200px;
    padding: 2px;
    font-size: 0.7em;
}

input, textarea, select {
    width: 200px;
    font-size: 0.7em;
    padding: 2px;
    border: 6px solid green; 
    border-radius: 3px;
}
#send {
    cursor: pointer;
    margin-top: 20px;
    background-color: greenyellow;
}
#send:hover {
    background-color: cyan;
}