.birthday-container {
    position: relative;
    text-align: center;
    padding: 0rem;
    min-height: 100vh;
    background: linear-gradient(135deg, #fbc2eb, #a6c1ee);
    color: #fff;
    overflow: hidden;
    font-family: 'Segoe UI', sans-serif;
}
    .birthday-container .content {
        padding-top: 2rem;
    }
    .birthday-container .celebrate {
        animation: pulse 1.5s infinite;
    }

/* Balloons */
.balloons {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.balloon {
    width: 60px;
    height: 80px;
    border-radius: 50%;
    position: absolute;
    bottom: -100px;
    animation: float 10s infinite ease-in;
}

    .balloon::after {
        content: "";
        position: absolute;
        width: 2px;
        height: 40px;
        background: #fff;
        left: 50%;
        bottom: -40px;
        transform: translateX(-50%);
    }

    .balloon.red {
        background: #ff4b5c;
        left: 10%;
        animation-delay: 0s;
    }

    .balloon.blue {
        background: #4b7bec;
        left: 30%;
        animation-delay: 2s;
    }

    .balloon.yellow {
        background: #feca57;
        left: 60%;
        animation-delay: 4s;
    }

    .balloon.green {
        background: #1dd1a1;
        left: 80%;
        animation-delay: 6s;
    }

@keyframes float {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
    }

    50% {
        transform: translateY(-500px) rotate(5deg);
        opacity: 0.9;
    }

    100% {
        transform: translateY(-1000px) rotate(-5deg);
        opacity: 0;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}