.site-title{font-size:2.5rem;color:#333}.difficulty-buttons-container{display:flex;justify-content:center;margin-top:10px}.difficulty-buttons a{margin:0 10px;padding:5px 10px;border-radius:5px;color:#fff;text-decoration:none}.introductory-button{background-color:#a3d3a2}.intermediate-button{background-color:#ffeb3b}.advanced-button{background-color:#f44336}