:root {
    --green-color: #008000;
    --green-color-transparent: rgba(0, 128, 0, 0.8);
    --red-color: #ff0000;
    --red-color-transparent: rgba(255, 0, 0, 0.8);
    --blue-color: #0000ff;
    --blue-color-transparent: rgba(0, 0, 255, 0.8);
    --selected-color: var(--blue-color);
    --selected-color-transparent: var(--blue-color-transparent);
}

header {
    display: flex;
    flex-direction: column;
    width: 100%;
    background-color: var(--selected-color);
    color: white;
    padding: 20px 0;
    font-size: 24px;
    font-family: "Sonsie One", system-ui;
    text-align: center;
}

button {
    display: flex;
    justify-content: center;
    padding-top: 5%;
    padding-bottom: 5%;
    background-color: var(--selected-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    width: 85%;
    height: 100%;
    font-family: "Sonsie One", system-ui;
}

button:hover {
    background-color: var(--selected-color-transparent);
}