body {
    margin: 0;
}

#balloon-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    padding: 1em;
    box-sizing: border-box;
    display: flex;
    flex-wrap: wrap;
    overflow: hidden;
    transition: opacity 500ms;
    z-index: 9999;
    pointer-events: none;
}

.balloon {
    height: 125px;
    width: 105px;
    border-radius: 75% 75% 70% 70%;
    position: relative;
    pointer-events: auto;
}

    .balloon:before {
        content: "";
        height: 75px;
        width: 1px;
        padding: 1px;
        background-color: #FDFD96;
        display: block;
        position: absolute;
        top: 125px;
        left: 0;
        right: 0;
        margin: auto;
    }

    .balloon:after {
        content: "▲";
        text-align: center;
        display: block;
        position: absolute;
        color: inherit;
        top: 120px;
        left: 0;
        right: 0;
        margin: auto;
    }

@keyframes float {
    from {
        transform: translateY(100vh);
        opacity: 1;
    }

    to {
        transform: translateY(-300vh);
        opacity: 0;
    }
}