html, body {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
}
body {
    display: flex;
    flex-direction: column;
}
h1 {
    margin: 0;
    height: 3rem;
    padding: 0 0.5rem;
    text-align: center;
    background-color: #f0f0f0;
    color: #4CAF50;
    text-shadow: 2px 2px 3px #a0a0a0;
}
h2 {
    margin: 0;
}
#app {
    flex: 1;
    width: 100%;
    height: 100%;
    overflow: hidden;
}
button {
    background-color: #4CAF50;
    color: white;
    border: 1px solid #4CAF50;
    border-radius: 0;
    padding: 2px 5px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s ease;
    margin: 2px;
}

button:hover {
    background-color: #45a049;
}

button.cancel-action {
    background-color: white;
    color: #4CAF50;
    border: 1px solid #4CAF50;
    border-radius: 0;
    padding: 2px 5px;   text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.2);
    transition: background-color 0.3s ease, color 0.3s ease;
}

button.cancel-action:hover {
    background-color: #f2f2f2;
    color: #45a049;
}
.pointer {
    cursor: pointer;
}