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

body {
  font-family: Arial, sans-serif;
  background: blue;
  display: flex;
  flex-direction: column;
  align-items: center;
}
        
.container {
  display: flex;
  flex-direction: column;
  max-width: 1200px;
  width: 100%;
  gap: 10px;
  margin-top: 100px;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: pink;
  border-bottom: 3px solid #333;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
}

nav {
  background: yellow;
  padding: 15px;
  border: 2px solid #333;
  position: sticky;
  top: 80px;
  z-index: 999;
}

main {
  display: flex;
  gap: 10px;
}

section {
  flex: 2;
  background: green;
  padding: 40px;
  border: 2px solid #333;
  min-height: 400px;
}

aside {
  flex: 1;
  background: red;
  padding: 40px;
  border: 2px solid #333;
  min-height: 400px;
}

footer {
  background: purple;
  padding: 20px;
  border-top: 3px solid #333;
  text-align: center;
}

canvas {
  display: block; 
  background: black;
  margin: auto;
}