body {
    margin: 0;
}

.container {
    display: flex;
    height: 100vh; /* ocupa a tela toda */
}

.coluna {
    width: 33%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 20px;
}

.coluna1 {
    background-color: #2196F3; /* Azul */
}

.coluna2 {
    background-color: #4CAF50; /* Verde */
}

.coluna3 {
    background-color: #f44336; /* Vermelho */
}