*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    background-color: lightpink;
}

#cat {
    width: 500px;
    transition: all 1.4s cubic-bezier(0.55, 0.085, 0.68, 0.53);
}

.move-right {
    transform: translateX(300px);
}

#treat{
    width: 300px;
    transition: all 0.2s ease;
    position: relative;
    z-index: 1;
}

#start #overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    font-size: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    visibility: hidden;
}