h1 {
    font-size: 32px;
}

h2 {
    font-size: 22px;
}

ul {
    list-style-type: none;
  }

li {
    font-size: 19px;
}

.toTry {
    color: grey;
}

.principal {
    margin: auto;
    width: 50%;
    border: 3px solid grey;
} 

.heading {
    display: flex;
    width: 100%;
    align-content: center;
    justify-content: center;
}

@media (max-width: 600px) {
    .principal {
        width: 90%;
    }
}