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Colorful Rainbow Color Palette CSS

/* CSS */
.color-1 {
  color: #FF6E61;
}

.color-2 {
  color: #6FBE6F;
}

.color-3 {
  color: #6E60BE;
}

.color-4 {
  color: #BE6FBE;
}

.color-5 {
  color: #FFC061;
}

/* CSS Variables */
:root {
  --color-1: #FF6E61;
  --color-2: #6FBE6F;
  --color-3: #6E60BE;
  --color-4: #BE6FBE;
  --color-5: #FFC061;
}

Colorful Rainbow Gradient CSS

/* Linear Gradient */
.linear-gradient {
 background: linear-gradient(0.25turn, #FF6E61, #6FBE6F, #6E60BE, #BE6FBE, #FFC061);
 }

/* Radial Gradient */
.radial-gradient {
 background: radial-gradient(circle, #FF6E61, #6FBE6F, #6E60BE, #BE6FBE, #FFC061);
 }

Colorful Rainbow Color Palette