气泡提示框设计，HTML/Vue代码在线实时编辑、预览

            
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            main {
    --dark-100: #282827;
    --dark-85: rgba(40, 40, 39, .85);
    --yellow: yellow;

    height: 100vh;
    background: #eee;
  
    display: flex;
    align-items: center;
    justify-content: center;
  
}

.btn_base {
    color: var(--dark-100);
    border-radius: 18px;
    justify-content: center;
    align-items: center;
    height: 75px;
    padding: 0 45px;
    font-size: 20px;
    font-weight: 700;
    line-height: 1.3;
    text-decoration: none;
    display: flex;
    box-shadow: 0 4px 16px rgba(40, 40, 39, 0.15);
    background-color: var(--yellow);

    &:hover {
        cursor: pointer;
    }
}

.btn_create {
    position: relative;
    perspective: 35em;

    .speech_bubble {
        position: absolute;
        top: -150%;
        left: -40%;
        margin: .5em auto;
        padding: 0 .5em 0 0.8em;
        display: flex;
        align-items: center;
        width: 11em;
        height: 4em;
        border-radius: .25em;
        transform: rotate(-7deg) rotateY(15deg);
        background: #629bdd;
        text-align: center;
        box-shadow: 1px 1px 4px 4px rgba(0, 0, 0, 0.2);
        animation: odsoky 2s ease-in-out infinite alternate;

    }

    @keyframes odsoky {
        0% {
            transform: rotate(-7deg) rotateY(15deg) translateY(6px);
        }

        100% {
            transform: rotate(-7deg) rotateY(15deg) translateY(1px);
        }
    }

    .speech_bubble:before,
    .speech_bubble:after {
        position: absolute;
        z-index: -1;
        content: '';
    }

    // 白板
    .speech_bubble:after {
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        border-radius: inherit;
        transform: rotate(2deg) translate(.35em, -.15em) scale(1.02);
        background: #f4fbfe;
    }

    // 箭头
    .speech_bubble:before {
        border: solid 0 transparent;
        border-right: solid 3.5em #f4fbfe;
        border-bottom: solid .25em #629bdd;
        bottom: .25em;
        left: 1.25em;
        width: 0;
        height: 1em;
        transform: rotate(45deg) skewX(55deg);
        box-shadow: 0px 0px 4px 4px rgba(0, 0, 0, 0.2);
    }

}