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デモ

See the Pen tool tip by logsuke (@design-list) on CodePen.

コード

<main>
        <section id="section1" class="section">

          <button id="top" class="button">top</button>
          <button id="right" class="button">right</button>
          <button id="bottom" class="button">bottom</button>
          <button id="left" class="button">left</button>

        </section>
    </main>

/*=== Base ===*/

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

:root {
    --nav-height: 8rem;
    --max-width: 1024px;
    --container-padding: 0 4rem;
    --gap: 2rem;
    --bg-color: rgb(240, 240, 240);
    --first-color: rgb(172, 245, 255);
}


/*=== Font ratio ===*/

html {
    scroll-behavior: smooth;
    font-size: 62.5%;
}

body {
    font-size: 1.6rem;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
}

.section {
    width: var(--max-width);
    margin: 0 auto;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 10rem;
}

/* tool tip */

.button {
    width: 150px;
    height: 50px;
    padding: .5rem 1rem;
    background: var(--first-color);
    border: none;
    font-size: 2rem;
    border-radius: .5rem;
    cursor: pointer;
    position: relative;
}

/* top */

#top::before {
    content: 'top';
    position: absolute;
    top: -75px;
    left: 50%;
    width: 100%;
    transform: translate(-50%, 5px);
    background: #ccc;
    padding: 1rem 2rem;
    border-radius: .5rem;
    transition: transform .3s;
    visibility: hidden;
    user-select: none;
}

#top::after {
    content: '';
    border-top: 15px solid #ccc;
    border-right: 15px solid transparent;
    border-bottom: 15px solid transparent;
    border-left: 15px solid transparent;
    position: absolute;
    top: -35px;
    left: 50%;
    transform: translate(-50%, 5px);
    transition: transform .3s;
    visibility: hidden;
    user-select: none;
}

#top:hover::before, #top:hover::after {
    visibility: visible;
    user-select: auto;
    transform: translate(-50%, 0);
}

/* right */

#right::before {
    content: 'right';
    position: absolute;
    top: 50%;
    right: calc(-100% - 75px);
    width: 100%;
    transform: translate(-5px, -50%);
    background: #ccc;
    padding: 1rem 2rem;
    border-radius: .5rem;
    transition: transform .3s;
    visibility: hidden;
    user-select: none;
}

#right::after {
    content: '';
    border-top: 15px solid transparent;
    border-right: 15px solid #ccc;
    border-bottom: 15px solid transparent;
    border-left: 15px solid transparent;
    position: absolute;
    top: 0;
    left: 0;
    top: 50%;
    right: -36px;
    transform: translate(-5px, -50%);
    transition: transform .3s;
    visibility: hidden;
    user-select: none;
}

#right:hover::before, #right:hover::after {
    visibility: visible;
    user-select: auto;
    transform: translate(0, -50%);
}

/* bottom */

#bottom::before {
    content: 'boottom';
    position: absolute;
    bottom: -75px;
    left: 50%;
    width: 100%;
    transform: translate(-50%, -5px);
    background: #ccc;
    padding: 1rem 2rem;
    border-radius: .5rem;
    transition: transform .3s;
    visibility: hidden;
    user-select: none;
}

#bottom::after {
    content: '';
    border-top: 15px solid transparent;
    border-right: 15px solid transparent;
    border-bottom: 15px solid #ccc;
    border-left: 15px solid transparent;
    position: absolute;
    bottom: -35px;
    left: 50%;
    transform: translate(-50%, -5px);
    transition: transform .3s;
    visibility: hidden;
    user-select: none;
}

#bottom:hover::before, #bottom:hover::after {
    visibility: visible;
    user-select: auto;
    transform: translate(-50%, 0);
}

/* left */

#left::before {
    content: 'left';
    position: absolute;
    top: 50%;
    left: calc(-100% - 75px);
    width: 100%;
    transform: translate(5px, -50%);
    background: #ccc;
    padding: 1rem 2rem;
    border-radius: .5rem;
    transition: transform .3s;
    visibility: hidden;
    user-select: none;
}

#left::after {
    content: '';
    border-top: 15px solid transparent;
    border-right: 15px solid transparent;
    border-bottom: 15px solid transparent;
    border-left: 15px solid #ccc;
    position: absolute;
    top: 0;
    left: 0;
    top: 50%;
    left: -36px;
    transform: translate(5px, -50%);
    transition: transform .3s;
    visibility: hidden;
    user-select: none;
}

#left:hover::before, #left:hover::after {
    visibility: visible;
    user-select: auto;
    transform: translate(0, -50%);
}