* {
    padding: 0;
    margin: 0;
}
body {
    height: 100vh;
    width: 100vw;
}

header {
    color: aliceblue;
    text-align: center;
}

#legenda {
    color: aliceblue;
    transition: 0.7s;
}

.formas {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

button {
    transition: 0.7s;
    border: none;
    cursor: pointer;
    padding: 0.6rem;
    outline: none;
}
#troca:hover {
    background-color: silver;
}
.modelo {
    height: 50vh;
    transition: 0.4s;
}

footer {
    color: aliceblue;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    text-align: center;
    text-decoration: none;
}

a {
    color: blue;
}