body {
  margin: 0;
  font-family: 'VT323', monospace;
  background: #fdfdfd;
  padding: 2em;
}
header h1 {
  text-align: center;
  margin-bottom: 1em;
}
.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1em;
}
.pattern-box {
  position: relative;
  height: 240px;
  border: 2px dashed #333;
  box-shadow: 4px 4px 0 #000;
  display: flex;
  align-items: flex-end;
  padding: 0;
}
textarea {
  width: 100%;
  height: 100px;
  font-family: monospace;
  font-size: 0.8em;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #999;
  margin: auto;
  padding: 0.5em;
  resize: none;
}

/* Pattern backgrounds */
.pattern-1 {
  background-color: #fff;
  background-image: 
    repeating-linear-gradient(45deg, #aaa 0, #aaa 1px, transparent 1px, transparent 6px),
    repeating-linear-gradient(-45deg, #aaa 0, #aaa 1px, transparent 1px, transparent 6px);
  background-size: 12px 12px;
}

.pattern-2 {
  background-color: #fff;
  background-image: 
    repeating-linear-gradient(135deg, #ccd 0 1px, transparent 1px 6px),
    repeating-linear-gradient(-135deg, #ccd 0 1px, transparent 1px 6px);
  background-size: 10px 10px;
}

.pattern-3 {
  background-color: #fefefe;
  background-image: 
    repeating-linear-gradient(90deg, #bbb 0 1px, transparent 1px 6px),
    repeating-linear-gradient(0deg, #bbb 0 1px, transparent 1px 6px);
  background-size: 8px 8px;
}

.pattern-4 {
background-color: #fff;
background-image: 
  repeating-linear-gradient(60deg, #6a8a7b 0, #6a8a7b 1px, transparent 1px, transparent 5px),
  repeating-linear-gradient(-60deg, #6a8a7b 0, #6a8a7b 1px, transparent 1px, transparent 5px);
background-size: 14px 14px;

}

.pattern-5 {
  background-color: #fff;
  background-image:
    repeating-linear-gradient(45deg, #999 0, #999 1px, transparent 1px, transparent 4px),
    repeating-linear-gradient(-45deg, #999 0, #999 1px, transparent 1px, transparent 4px);
  background-size: 8px 8px;
}
.pattern-6 {
  background-color: #fdfdfd;
  background-image:
    repeating-linear-gradient(30deg, #bbb 0, #bbb 1px, transparent 1px, transparent 12px),
    repeating-linear-gradient(90deg, #bbb 0, #bbb 1px, transparent 1px, transparent 12px),
    repeating-linear-gradient(-30deg, #bbb 0, #bbb 1px, transparent 1px, transparent 12px);
  background-size: 16px 16px;
}
.pattern-7 {
  background-color: #fafafa;
  background-image:
    repeating-linear-gradient(45deg, #ccc 0, #ccc 1px, transparent 1px, transparent 10px),
    repeating-linear-gradient(-45deg, #ccc 0, #ccc 1px, transparent 1px, transparent 10px);
  background-size: 14px 14px;
  opacity: 0.8;
}
.pattern-8 {
  background-color: #fff;
  background-image:
    linear-gradient(#aaa 1px, transparent 1px),
    linear-gradient(90deg, #aaa 1px, transparent 1px);
  background-size: 6px 6px;
}

.pattern-9 {
  background-color: #fff;
  background-image:
    repeating-linear-gradient(25deg, #5a6d85 0 2px, transparent 2px 10px),
    repeating-linear-gradient(60deg, #5a6d85 0 2px, transparent 2px 10px),
    repeating-linear-gradient(120deg, #5a6d85 0 2px, transparent 2px 10px),
    repeating-linear-gradient(150deg, #5a6d85 0 2px, transparent 2px 10px);
  background-size: 18px 18px;
  opacity: 0.9;
}

.pattern-10 {
  background-color: #fff;
  background-image:
    radial-gradient(#8db2d3 0.8px, transparent 0.8px),
    radial-gradient(#8db2d3 0.8px, transparent 0.8px);
  background-size: 10px 10px;
  background-position: 0 0, 5px 5px;
  opacity: 0.9;
}