:root{--bg-color: #f8f9fa;--text-color: #212529;--link-color: #007bff;--link-hover-color: #0056b3;font-size:20px}:root .theme-button{cursor:pointer;font-size:1.25rem;border:none;background-color:rgba(0,0,0,0);color:inherit}:root .theme-button::after{content:"🌑"}[data-theme=dark]{--bg-color: #212529;--text-color: #f8f9fa;--link-color: #007bff;--link-hover-color: #0056b3}[data-theme=dark] .theme-button::after{content:"☀️"}body,html{display:flex;flex-direction:column;min-height:100vh;margin:0 auto;font-family:Times,"Times New Roman",serif;color:var(--text-color);background-color:var(--bg-color)}@media (min-width: 768px){body,html{max-width:80%;width:80%}}@media (max-width: 767px){body,html{width:95%}}a{color:var(--link-color);text-decoration:none}a:hover{color:var(--link-hover-color)}header{flex-shrink:0;display:flex;justify-content:space-between;flex-direction:row;flex-wrap:wrap;align-items:center}header .header-nav-container{display:flex;justify-content:space-between;flex-direction:row;flex-wrap:wrap;align-items:center}header nav ul{display:flex;flex-direction:row;flex-wrap:wrap;list-style:none;padding:0}header nav ul li{margin-left:1rem;font-size:1.25rem}main{flex-grow:1;display:flex;flex-direction:column}.center-container{flex-grow:1;display:flex;justify-content:center;align-items:center;flex-direction:column;margin-top:2rem;margin-bottom:2rem}h1,h2,h3,h4,h5,h6{margin-top:.5rem;margin-bottom:.5rem}