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Cool Blue Color Palette CSS

/* CSS */
.color-1 {
  color: #A3D6E0;
}

.color-2 {
  color: #A2C7E7;
}

.color-3 {
  color: #599BD4;
}

.color-4 {
  color: #3B6E9B;
}

.color-5 {
  color: #2A4A7A;
}

/* CSS Variables */
:root {
  --color-1: #A3D6E0;
  --color-2: #A2C7E7;
  --color-3: #599BD4;
  --color-4: #3B6E9B;
  --color-5: #2A4A7A;
}

Cool Blue Gradient CSS

/* Linear Gradient */
.linear-gradient {
  background: linear-gradient(0.25turn, #A3D6E0, #A2C7E7, #599BD4, #3B6E9B, #2A4A7A);
 }

/* Radial Gradient */
.radial-gradient {
  background: radial-gradient(circle, #A3D6E0, #A2C7E7, #599BD4, #3B6E9B, #2A4A7A);
 }

Cool Blue Color Palette