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

:root {
    --bg-color: linear-gradient(-90deg, #ff04ff, #2ad4ff);
    --color-white-smoke: #f5f5f5;
}

body {

    background: var(--bg-color);
}

.container {
    width: 100%;
    padding: 2rem;
}

.box-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    row-gap: 1rem;
    filter: drop-shadow(2px 4px 6px black);
    margin: 3rem auto;
}

.box {
    height: 400px;
    min-width: 300px;
    border-radius: 10px;
    position: relative; 
    overflow: hidden;
}


.box > div {
    position: absolute;
    bottom: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    background-color: rgba(0, 0, 0, 0.4);  /*transparent */
    color: var(--color-white-smoke);
    align-items: center; 
}


.copy-color-values p {
    font-family: 'Nunito Sans', sans-serif;
    margin-bottom: 0;
}

.btn {
    color: var(--color-white-smoke);
    position: relative;
}


.tool-tip-msg {
    display: none;
    height: fit-content;
    min-width: 30px;
    position: absolute;
    background-color: var(--color-white-smoke);
    color: black;
    padding: 0.2rem 0.5rem;
    border-radius: 20px;
    top: -10px;
    font-size: 0.8rem;
    left: 0.5rem;
}


button:hover + .tool-tip-msg {             /* Adjacent sibling  (immediate sibling) selector using '+' */
    display: block;
}


@media screen and (width < 700px) {

    .box {
        height: 150px;
    }

    .box > div {
        padding: 0.3rem 1rem;
    }
 
}