md.css

/* md.css */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;700&family=Source+Code+Pro&display=swap');

:root {
  --primary-color: #2c3e50;
  --secondary-color: #34495e;
  --accent-color: #3498db;
  --text-color: #333;
  --bg-color: #ecf0f1;
  --editor-bg: #fff;
  --preview-bg: #f9f9f9;
  --border-color: #bdc3c7;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  padding: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.title {
  text-align: center;
  color: var(--primary-color);
  margin-bottom: 20px;
  font-size: 2.5rem;
}

.editor-container, .preview-container {
  margin-bottom: 20px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h2 {
  background-color: var(--secondary-color);
  color: white;
  padding: 10px;
  font-size: 1.2rem;
}

#editor, #preview {
  width: 100%;
  min-height: 300px;
  padding: 20px;
  border: none;
  font-size: 16px;
}

#editor {
  resize: vertical;
  font-family: 'Source Code Pro', monospace;
  background-color: var(--editor-bg);
}

#preview {
  background-color: var(--preview-bg);
  overflow-wrap: break-word;
}

/* Preview Styles */
#preview h1, #preview h2, #preview h3, #preview h4, #preview h5, #preview h6 {
  margin-top: 24px;
  margin-bottom: 16px;
  font-weight: 600;
  line-height: 1.25;
}

#preview h1 {
  font-size: 2em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3em;
}

#preview h2 {
  font-size: 1.5em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3em;
}

#preview a {
  color: var(--accent-color);
  text-decoration: none;
}

#preview a:hover {
  text-decoration: underline;
}

#preview code {
  background-color: rgba(27, 31, 35, 0.05);
  border-radius: 3px;
  font-family: 'Source Code Pro', monospace;
  font-size: 85%;
  margin: 0;
  padding: 0.2em 0.4em;
}

#preview pre {
  background-color: #f6f8fa;
  border-radius: 3px;
  font-size: 85%;
  line-height: 1.45;
  overflow: auto;
  padding: 16px;
}

#preview blockquote {
  border-left: 0.25em solid #dfe2e5;
  color: #6a737d;
  padding: 0 1em;
}

#preview img {
  max-width: 100%;
  box-sizing: content-box;
}

#preview ul, #preview ol {
  padding-left: 2em;
}

/* Responsive Design */
@media (min-width: 768px) {
  .container {
    flex-direction: row;
    justify-content: space-between;
  }

  .editor-container, .preview-container {
    width: 48%;
  }
}

@media (max-width: 767px) {
  .editor-container, .preview-container {
    width: 100%;
  }
}