<style>
.yanip-sonme {
    text-align: center;
}

.yanip-sonme {
    font-size: 36px;
    color: #333;
    animation: yanip-sonme 1s ease-in-out infinite alternate;
}

@keyframes yanip-sonme {
    0% {
        opacity: 1;
    }
    100% {
        opacity: 0.3;
    }
}
</style>
    <div class="yanip-sonme">
        <p>Merhaba, Ben Yanıp Sönüyorum!</p>
    </div>