body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

section {
    margin-bottom: 20px;
}

h2, h3, h4, p, ul li {
    margin: 10px 0;
}

.pulsate {
    animation: pulsate 1.5s infinite;
}

@keyframes pulsate {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

h3.pulsate:nth-child(1) { color: #3498db; }
h3.pulsate:nth-child(2) { color: #557788; }
h3.pulsate:nth-child(3) { color: #226688; }
h3.pulsate:nth-child(4) { color: #447799; }

h3.pulsate:nth-child(5) { color: #9b59b6; }
h3.pulsate:nth-child(6) { color: #34495e; }
h3.pulsate:nth-child(7) { color: #16a085; }