body {
    background-color: #0078D7;
    color: white;
    font-family: Arial, sans-serif;
    text-align: center;
}
.container {
    margin-top: 50px;
}
.btn {
    display: inline-block;
    padding: 10px 20px;
    margin: 10px;
    text-decoration: none;
    background: #fff;
    color: #0078D7;
    border-radius: 5px;
}
.red { background: red; color: white; }
.update-screen {
    background-color: black;
}
.update-container {
    margin-top: 20%;
}
.progress-bar {
    width: 50%;
    height: 10px;
    background: gray;
    margin: 20px auto;
    border-radius: 5px;
    overflow: hidden;
}
.progress {
    height: 100%;
    width: 0;
    background: lightgreen;
}
.blue-screen {
    background: #0000aa;
    color: white;
    text-align: center;
    font-size: 2em;
}