.popup {
    display: none;
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

/* Popup Box */
.popup-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    width: 300px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.3);
}

/* Close Button */
.close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 20px;
    cursor: pointer;
}

/* Balloon Animation */
.balloons-container {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
    top: 0;
    left: 0;
}

.balloon {
    position: absolute;
    bottom: -50px;
    width: 30px;
    height: 40px;
    background-color: red;
    border-radius: 50%;
    animation: rise 5s linear infinite;
}

.balloon:nth-child(2) {
    left: 40%;
    background-color: blue;
    animation-duration: 6s;
}

.balloon:nth-child(3) {
    left: 70%;
    background-color: green;
    animation-duration: 4s;
}

.balloon:nth-child(4) {
    left: 70%;
    background-color: orange;
    animation-duration: 4s;
}


.balloon:nth-child(5) {
    left: 70%;
    background-color: yellow;
    animation-duration: 4s;
}


.balloon:nth-child(6) {
    left: 70%;
    background-color: chartreuse;
    animation-duration: 4s;
}


@keyframes rise {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(-500px); opacity: 0; }
}