style.css

body {
    font-family: "Roboto", sans-serif;
    background-color: #cd1628;
    color: white;
    text-align: center;
}

h1 {
    text-align: center;
}

#jsonFile {
    padding: 7px 30px;
}

input[type="file"]::file-selector-button {
    font-weight: 800;
    font-family: "Roboto", sans-serif;
    border-radius: 4px;
    padding: 10 2px;
    height: 40px;
    cursor: pointer;
    background-color: white;
    border: 1px solid rgba(0, 0, 0);
    box-shadow: 0px 1px 0px rgba(0, 0, 0, 0.05);
    border-radius: 10px;
    margin-right: 16px;
    transition: background-color 200ms;
}

input[type="file"]::file-selector-button:hover {
    background-color: #cd1628;
    color: white;
}

input[type="file"]::file-selector-button:active {
    background-color: #e25b68;
}

.btn {
    display: flex;
    justify-content: center;
}

#uploadButton {
    margin-top: 15px;
    padding: 7px 30px;
    font-weight: 800;
    display: flex;
    border: 1px solid black;
    border-radius: 10px;
}