html {
    font-size: 16px;
    font-family: "Open Sans", sans-serif;
    background: #00539F;
}

.titulo{
    text-align: center;
    font-size: 60px;
    text-shadow: 5px 3px 1px black;
    color: #00539F;
}
body{
    width: 650px;
    margin: 0 auto;
    background-color: chocolate;
    padding: 50px 20px 50px 20px;
    border: 5px solid black;
    border-radius: 25px;
}
img{

    display: block;
    margin: 0 auto;
}

button {
    font-size: 16px;
    margin: 10px;
    padding: 10px 20px;
    cursor: pointer;
    border-radius: 16px;
    background-color: aqua;
    color: black;
}

button:hover {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}