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<html><head><style>:root { --blue: #1e90ff; --white: #fff;}body { background-color: var(--blue);}h2 { border-bottom: 2px solid var(--blue);}.container { color: var(--blue); background-color: var(--white); padding: 15px;}button { background-color: var(--white); color: var(--blue); border: 1px solid var(--blue); padding: 5px;}</style></head><body><h1>Использование функции var()</h1><div class="container"> <h2>Lorem Ipsum</h2> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.</p> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam semper diam at erat pulvinar, at pulvinar felis blandit.</p> <p> <button>Да</button> <button>Нет</button> </p></div></body></html>