styles.css

body {
    width: 100%;
    height: 100%;
    min-height: 100vh;
    padding: 0;
    margin: 0;
    background-color: #100e17;
    color: #fff;
    font-family: Verdana;
    font-size: 16px;
    display: flex;
    justify-content: center;
}

main {
    display: flex;
    flex-direction: column;
}

#inputFile {
	width: 0.1px;
	height: 0.1px;
	opacity: 0;
	overflow: hidden;
	position: absolute;
	z-index: -1;
}

#inputFile + label {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: #fff;
    background-color: #009ea9;
    display: inline-block;
    padding: 10px;
    cursor: pointer;
}

#inputFile:focus + label,
#inputFile + label:hover {
    background-color: #017981;
}

h1  {
    margin-top: 60px;
}
.video-input {
    margin-top: 40px;
}

#loadingText {
    margin-top: 50px;
}

#videoElement {
    background-color: #000;
}

button {
    background-color: #009ea9;
    border: 0;
    color: #fff;
    width: 248px;
    padding: 10px;
    margin-top: 20px;
    font-size: 14px;
    font-weight: bold;
}

button:hover,
button:focus {
    background-color: #017981;
}