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HTML 

              
                <center>
  <h1>Maritime Signal Flags Translator</h1>
  <hr/>
<input type="text" id="message" value="Happy Sailing">
<button onclick="convert();">Submit</button>
</center>
<hr/>
<div id="output">
  
</div>
!

CSS 

              
                @white: rgb(255,255,255);
@blue: rgb(25,78,156);
@yellow: rgb(251,209,27);
@red: rgb(205,19,43);
@black: rgb(0,0,0);
@flagSize: 4em;

body {
  background-color: #ccc;
  margin: 1em;
  font-size: 20px;
  font-family: arial;
}

INPUT, BUTTON {
  font-size: 20px;
  padding: 6px;
}

H1 {
  color: @blue;
   margin-bottom: 0px;
}

.flag {
  position: relative;
  float: left;
  width: @flagSize;
  height: @flagSize;
  margin: @flagSize/5;
  background-color: #fff;
  -webkit-box-sizing: border-box;
  -webkit-filter: drop-shadow(@flagSize/20 @flagSize/20 @flagSize/10 rgba(0,0,0,0.3)); 
  -webkit-transition: -webkit-transform 0.3s, background-color 0.7s;
  -webkit-transition-timing-function: cubic-bezier(.76,.13,.19,1.44);
  -webkit-transform-style: preserve-3d;
}
.flag:hover {
  transform: scale(1.5,1.5);
}

.flagA {
  background: transparent;
  border-top: @flagSize/2 solid @blue;
  border-right: @flagSize/3 solid transparent;
  border-bottom: @flagSize/2 solid @blue;
}
.flagA:before {
  content: "";
  position: absolute;
  top: -@flagSize/2;
  left: 0;
  height: @flagSize;
  width: @flagSize/2;
  background-color: white;
  z-index: 5;
}
.flagB {
  background: transparent;
  border-top: @flagSize/2 solid @red;
  border-right: @flagSize/3 solid transparent;
  border-bottom: @flagSize/2 solid @red;
}
.flagC {
  background: -webkit-linear-gradient(top, @blue 0%, @blue 20%, white 20%, white 40%, @red 40%, @red 60%, white 50%, white 80%, @blue 80%, @blue 100%);
}
.flagD {
  background: -webkit-linear-gradient(top, @yellow 0%, @yellow 25%, @blue 25%, @blue 75%, @yellow 75%, @yellow 100%);
}
.flagE {
  background: -webkit-linear-gradient(top, @blue 0%, @blue 50%, @red 50%, @red 100%);
}
.flagF {
  background-color: @red;
  background-image: linear-gradient(45deg, white 25%, transparent 25%, transparent 75%, white 75%), linear-gradient(-45deg, white 25%, transparent 25%, transparent 75%, white 75%);
}
.flagG {
  background: -webkit-linear-gradient(left, @yellow 0%, @yellow 16.66%, @blue 16.66%, @blue 33.33%, @yellow 33.33%, @yellow 50%, @blue 50%, @blue 66.66%, @yellow 66.66%, @yellow 83.33%, @blue 83.33%, @blue 100%);
}
.flagH {
  background: -webkit-linear-gradient(left, white 0%, white 50%, @red 50%, @red 100%);
}
.flagI {
  background-color: @yellow;
}
.flagI:after {
  content: "";
  background-color: @black;
  width: 50%;
  height: 50%;
  position: absolute;
  left: 25%;
  top: 25%;
  border-radius: 50%;
}
.flagJ {
    background: -webkit-linear-gradient(top, @blue 0%, @blue 33.33%, white 33.33%, white 66.66%, @blue 66.66%, @blue 100%);
}
.flagK {
  background: -webkit-linear-gradient(left, @yellow 0%, @yellow 50%, @blue 50%, @blue 100%);
}
.flagL {
  background-color: @black;
  background-image: linear-gradient(0, @yellow, @yellow), linear-gradient(0, @yellow, @yellow);
  background-size: 50% 50%;
  background-repeat: no-repeat;
  background-position: 0 0, 100% 100%;
}
.flagM {
  background-color: @blue;
  background-image: linear-gradient(45deg, transparent 42.93%, white 42.93%, white 57.07%, transparent 57.07%), linear-gradient(-45deg, transparent 42.93%, white 42.93%, white 57.07%, transparent 57.07%)
}
.flagN {
  background-image: linear-gradient(-45deg, @blue 25%, transparent 25%, transparent 75%, @blue 75%, @blue), 
  linear-gradient(-45deg, @blue 25%, transparent 25%, transparent 75%, @blue 75%, @blue);
  background-size: 50% 50%;
  background-position: 0 0, 50% 50%;
}
.flagO {
  background-image: linear-gradient(45deg, @yellow 50%, @red 50%)
}
.flagP {
  background-image: linear-gradient(0, @blue 33.33%, transparent 33.33%, transparent 66.66%, @blue 66.66%), linear-gradient(90deg, @blue 33.33%, transparent 33.33%, transparent 66.66%, @blue 66.66%);
}
.flagQ {
  background-color: @yellow;
}
.flagR {
  background-color: @red;
  background-image: linear-gradient(0, transparent 40%, @yellow 40%, @yellow 60%, transparent 60%), linear-gradient(90deg, transparent 40%, @yellow 40%, @yellow 60%, transparent 60%);
}
.flagS {
  background-color: @blue;
  background-image: linear-gradient(0, white 33.33%, transparent 33.33%, transparent 66.66%, white 66.66%), linear-gradient(90deg, white 33.33%, transparent 33.33%, transparent 66.66%, white 66.66%);
}
.flagT {
  background-image: linear-gradient(90deg, @red 33.33%, white 33.33%, white 66.66%, @blue 66.66%);
}
.flagU {
  background-image: linear-gradient(0, @red, @red), linear-gradient(0, @red, @red);
  background-size: 50% 50%;
  background-repeat: no-repeat;
  background-position: 0 0, 100% 100%;
}
.flagV {
  background-image: linear-gradient(45deg, transparent 42.93%, @red 42.93%, @red 57.07%, transparent 57.07%), linear-gradient(-45deg, transparent 42.93%, @red 42.93%, @red 57.07%, transparent 57.07%)
}
.flagW {
  background-image: linear-gradient(90deg, @blue 20%, white 20%, white 40%, transparent 40%, transparent 60%, white 60%, white 80%, @blue 80%), linear-gradient(0, @blue 20%, white 20%, white 40%, @red 40%, @red 60%, white 60%, white 80%, @blue 80%);
  background-size: 100% 60%, 100% 100%;
  background-repeat: no-repeat;
  background-position: 0 50%, 0 0;
}
.flagX {
  background-image: linear-gradient(0, transparent 40%, @blue 40%, @blue 60%, transparent 60%), linear-gradient(90deg, transparent 40%, @blue 40%, @blue 60%, transparent 60%);
}
.flagY {
  background: -webkit-linear-gradient(-45deg, @yellow 0%, @yellow 10%, @red 10%, @red 20%, @yellow 20%, @yellow 30%, @red 30%, @red 40%, @yellow 40%, @yellow 50%, @red 50%, @red 60%, @yellow 60%, @yellow 70%, @red 70%, @red 80%, @yellow 80%, @yellow 90%, @red 90%, @red 100%);
}
.flagZ {
  background-repeat: no-repeat;
  background-image: linear-gradient(45deg, @black 50%, @yellow 50%), linear-gradient(-45deg, @blue 50%, @yellow 50%), linear-gradient(-45deg, @red 50%, @black 50%), linear-gradient(45deg, @red 50%, @blue 50%);
  background-size: 50% 50%;
  background-position: 0% 0%, 100% 0%, 0% 100%, 100% 100%;
}

.flag0 { 
    @crossLegThickness: 6%;
    @nearCrossStart: 15% - @crossLegThickness/2;
    @nearCrossEnd: 15% + @crossLegThickness/2;
    @middleCrossStart: 50% - @crossLegThickness/2;
    @middleCrossEnd: 50% + @crossLegThickness/2;
    @farCrossStart: 85% - @crossLegThickness/2;
    @farCrossEnd: 85% + @crossLegThickness/2;
  
    background-repeat: no-repeat;
    background-color: white;
    background-position:
        top,
        left,
        0 0,
        0 0,
        0 0,
        0 0
        ;
    background-size:
        33% 100%,
        100% 33%,
        100% 100%,
        100% 100%,
        100% 100%,
        100% 100%
        ;
    background-image:
        linear-gradient(
            to bottom,
            @white 33%,
            transparent 33%,
            transparent 66%,
            @white 66%
        ),
        linear-gradient(
            to right,
            @white 33%,
            transparent 33%,
            transparent 66%,
            @white 66%
        ),
        linear-gradient(
            to right,
            @white 0,
            @white 5%,
            transparent 5%,
            transparent 25%,
            @white 25%,
            @white 40%,
            transparent 40%,
            transparent 60%,
            @white 60%,
            @white 75%,
            transparent 75%,
            transparent 95%,
            @white 95%
        ),
        linear-gradient(
            to bottom,
            @white 0,
            @white 5%,
            transparent 5%,
            transparent 25%,
            @white 25%,
            @white 40%,
            transparent 40%,
            transparent 60%,
            @white 60%,
            @white 75%,
            transparent 75%,
            transparent 95%,
            @white 95%
        ),
        linear-gradient(
            to right,
            transparent 0,
            transparent @nearCrossStart,
            @blue @nearCrossStart,
            @blue @nearCrossEnd,
            transparent @nearCrossEnd,
            transparent @middleCrossStart,
            @blue @middleCrossStart,
            @blue @middleCrossEnd,
            transparent @middleCrossEnd,
            transparent @farCrossStart,
            @blue @farCrossStart,
            @blue @farCrossEnd,
            transparent @farCrossEnd
        ),
        linear-gradient(
            to bottom,
            transparent 0,
            transparent @nearCrossStart,
            @blue @nearCrossStart,
            @blue @nearCrossEnd,
            transparent @nearCrossEnd,
            transparent @middleCrossStart,
            @blue @middleCrossStart,
            @blue @middleCrossEnd,
            transparent @middleCrossEnd,
            transparent @farCrossStart,
            @blue @farCrossStart,
            @blue @farCrossEnd,
            transparent @farCrossEnd
        );
}

.flag1 {
    background: -webkit-linear-gradient(top, @red 33.33%, @yellow 33.33%, @yellow 66.66%, @red 66.66%);
}
.flag2 {
    background: -webkit-linear-gradient(top, @yellow 33.33%, @red 33.33%, @red 66.66%, @yellow 66.66%);
}
.flag3 {
    background: -webkit-linear-gradient(top, @blue 33.33%, @red 33.33%, @red 66.66%, @blue 66.66%);
}
.flag4 {
  background-color: @red;
  background-image: linear-gradient(45deg, transparent 42.93%, white 42.93%, white 57.07%, transparent 57.07%), linear-gradient(-45deg, transparent 42.93%, white 42.93%, white 57.07%, transparent 57.07%)
}
.flag5 {
  background-color: @yellow;
  background-image: linear-gradient(45deg, transparent 42.93%, @blue 42.93%, @blue 57.07%, transparent 57.07%), linear-gradient(-45deg, transparent 42.93%, @blue 42.93%, @blue 57.07%, transparent 57.07%)
}
.flag6 {
  background-image: linear-gradient(-45deg, white 14.29%, @blue 14.29%, @blue 28.57%, white 28.57%, white 42.86%, @blue 42.86%, @blue 57.14%, white 57.14%, white 71.43%, @blue 71.43%, @blue 85.71%, white 85.71%)
}
.flag7 {
  background-image: linear-gradient(90deg, @red 33.33%, white 33.33%, white 66.66%, @red 66.66%);
}
.flag8 {
  background-image: linear-gradient(90deg, @yellow 33.33%, @blue 33.33%, @blue 66.66%, @yellow 66.66%);
}
.flag9 {
  background-image: linear-gradient(90deg, @blue 33.33%, white 33.33%, white 66.66%, @blue 66.66%);
}
!

JS 

              
                //Maritime Signal Flags Translator by 101Computing.net
//www.101Computing.net/maritime-signal-flags-translator/

function convert() {
   var input = document.getElementById("message").value.toUpperCase();
   var output = document.getElementById("output");
   //Reset Output box
   output.innerHTML="";
  
   //Loop through each character
   for (var i = 0; i < input.length; i++) {
      var character = input.charAt(i);
      if ("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".indexOf(character)>=0) {
         var flag = document.createElement("DIV");  
         flag.className="flag flag" + character;
         output.appendChild(flag); 
      }
   }
}

convert();
!
999px

Console