style1.css

* {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.title-red {
    color: red;
}
.title-blue {
    color: blue;
}
.center {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 30vh;
}
button {
    background-color: rgb(253, 253, 253);
    border: 2px solid black;
    padding: 1em;
    margin: 1em;
}
img {
    margin: 1em;
}
 .letsgo {
        animation: shake 0.5s;
        animation-iteration-count: infinite;
    }
 @keyframes shake {
    0% { transform: translate(1px, 1px) rotate(0deg); }
    10% { transform: translate(-1px, -2px) rotate(-1deg); }
    20% { transform: translate(-3px, 0px) rotate(1deg); }
    30% { transform: translate(3px, 2px) rotate(0deg); }
    40% { transform: translate(1px, -1px) rotate(1deg); }
    50% { transform: translate(-1px, 2px) rotate(-1deg); }
    60% { transform: translate(-3px, 1px) rotate(0deg); }
    70% { transform: translate(3px, 1px) rotate(-1deg); }
    80% { transform: translate(-1px, -1px) rotate(1deg); }
    90% { transform: translate(1px, 2px) rotate(0deg); }
    100% { transform: translate(1px, -2px) rotate(-1deg); }
 }