:root {
    --primary-color: #4a90e2;
    --navigation-color: #Fa90e2;
    --alarm-color: #FF9062;
    --background-color: #f4f4f4;
    --text-color: #000;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
}

.screen {
    text-align: center;
}

.hidden {
    display: none !important;
}

.navigation button {
    background-color: var(--navigation-color);
    border-radius: 5px;
}

.navigation img.to-settings {
    position: fixed;
    right: 10px;
    top: 10px;

    background-color: var(--primary-color);
    height: 40px;
    width: 40px;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.navigation img.to-chart {
    position: fixed;
    right: 60px;
    top: 10px;

    background-color: var(--primary-color);
    height: 40px;
    width: 40px;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#factory-reset {
    background-color: var(--alarm-color);
}

img:hover {
    opacity: 0.5;
}
button:hover {
    opacity: 0.5;
}