body,
html {
    height: 100%;
    margin: 0;
    font-family: 'Comic Sans MS';
}

h1 {
    font-size: 550%;
    font-weight: bold;
    transition: color 0.5s;
}

.circulo {
    width: 175px;
    height: 175px;
    border-radius: 50%;
    background-color: white;
    border: 8px solid #0d6efd;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 4rem;
    font-weight: bold;
    color: #0d6efd;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}