* {
    box-sizing: border-box;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.item {
    border: .5rem solid red;
    border-radius: 1rem;

    position: absolute;
    background-color: black;
    margin: auto;

    text-align: center;
}

.ball {
    padding: 5rem;

    border: .5rem solid red;
    border-radius: 5rem;

    background-color: blue;

    left: 0;
    top: 5rem;

    transform: scale(1);
    transition: top 2s ease-out, left 2s ease-out, transform 2s ease-out;
}

.ball:hover {
    background-color: orange;

    left: 50rem;
    top: 40rem;

    transform: scale(.125);
    transition: top 5s ease-in, left 5s ease-in, transform 5s linear;
}

.target {
    padding: 3rem;
    background-color: gray;

    border-radius: 3rem;
    border: 1rem solid rgba(0, 128, 0, 0.5);

    left: 50rem;
    top: 40rem;
}

.target:hover {
    transform: scale(1.2);
}

.secret {
    border: none;

    background-color: transparent;
    /* background-color: rgb(0, 0, 0, .3); */
    color: transparent;
    position: absolute;
    padding: .5rem;

    left: 49.5rem;
    top: 39.5rem;
}

.secret:hover {
    background-color: red;

    background-image: url("img/witch.jpg");
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-size: cover;

    left: 1rem;
    right: 1rem;
    top: 1rem;
    bottom: 1rem;
}

.hide {
    transform: scale(0%);
    transition: transform 2.5s ease-in;
}

.welcome {
    background-color: rgba(128, 255, 0, 0.9);

    font-size: 4rem;
    text-align: center;
    padding: 2rem;

    position: absolute;
    z-index: 10;
    left: 3rem;
    right: 3rem;
    top: 3rem;
    bottom: 3rem;
}

.start {
    font-size: 6rem;
    margin: .5rem;
    color: red;
    cursor: pointer;
}

@media (min-width: 900px){
    .mobile {
        transform: scale(0%); 
    }
}

@media (max-width: 900px){
    .welcome {
        transform: scale(0%);
    }

    .mobile {
        transform: scale(100%);

        background-color: rgba(255, 136, 0, 0.9);

        text-align: center;
        padding: 5rem;

        border-radius: 1rem;

        position: absolute;
        z-index: 11;
        left: 3rem;
        right: 3rem;
        top: 3rem;
        bottom: 3rem;
    }
}