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HTML 

              
                <div class="grid">
<div class="div1"></div>
<div class="div2"></div>
<div class="div3"></div>
<div class="div4"></div>
<div class="div5"></div>
</div>
!

CSS 

              
                :root{
    --val1: 12;
    --val2: 16;
    --val3: 9;
    --val4: 11;
    --val5: 7;
    
    --max-val: 20;
    
        
    --arr1s0: var(--val1);
    --arr2s0: var(--val2);
    --arr3s0: var(--val3);
    --arr4s0: var(--val4);
    --arr5s0: var(--val5);
    
    /* step 1 - check 1 and 2*/
    --is-1-greater-2-step-1: Min(1, Max(var(--arr1s0) - var(--arr2s0), 0));
    --is-2-greater-1-step-1: (1 - var(--is-1-greater-2-step-1));
  
    --arr1s1: calc(var(--is-2-greater-1-step-1) * var(--arr1s0) + var(--is-1-greater-2-step-1) * var(--arr2s0));
    --arr2s1: calc(var(--is-1-greater-2-step-1) * var(--arr1s0) + var(--is-2-greater-1-step-1) * var(--arr2s0)); 
    --arr3s1: var(--arr3s0);
    --arr4s1: var(--arr4s0);
    --arr5s1: var(--arr5s0);
    
    /* step 2 - check 2 and 3*/
    --is-2-greater-3-step-2: Min(1, Max(var(--arr2s1) - var(--arr3s1), 0));
    --is-3-greater-2-step-2: (1 - var(--is-2-greater-3-step-2));
  
    --arr1s2: var(--arr1s1);
    --arr2s2: calc(var(--is-3-greater-2-step-2) * var(--arr2s1) + var(--is-2-greater-3-step-2) * var(--arr3s1));
    --arr3s2: calc(var(--is-2-greater-3-step-2) * var(--arr2s1) + var(--is-3-greater-2-step-2) * var(--arr3s1)); 
    --arr4s2: var(--arr4s1);
    --arr5s2: var(--arr5s1);
    
    /* step 3 - check 3 and 4*/
    --is-3-greater-4-step-3: Min(1, Max(var(--arr3s2) - var(--arr4s2), 0));
    --is-4-greater-3-step-3: (1 - var(--is-3-greater-4-step-3));
  
    --arr1s3: var(--arr1s2);
    --arr2s3: var(--arr2s2);
    --arr3s3: calc(var(--is-4-greater-3-step-3) * var(--arr3s2) + var(--is-3-greater-4-step-3) * var(--arr4s2));
    --arr4s3: calc(var(--is-3-greater-4-step-3) * var(--arr3s2) + var(--is-4-greater-3-step-3) * var(--arr4s2)); 
    --arr5s3: var(--arr5s2);
    
    /* step 4 - check 4 and 5*/
    --is-4-greater-5-step-4: Min(1, Max(var(--arr4s3) - var(--arr5s3), 0));
    --is-5-greater-4-step-4: (1 - var(--is-4-greater-5-step-4));
  
    --arr1s4: var(--arr1s3);
    --arr2s4: var(--arr2s3);
    --arr3s4: var(--arr3s3);
    --arr4s4: calc(var(--is-5-greater-4-step-4) * var(--arr4s3) + var(--is-4-greater-5-step-4) * var(--arr5s3));
    --arr5s4: calc(var(--is-4-greater-5-step-4) * var(--arr4s3) + var(--is-5-greater-4-step-4) * var(--arr5s3)); 
    
    
    
    /* step 5 - check 1 and 2*/
    --is-1-greater-2-step-5: Min(1, Max(var(--arr1s4) - var(--arr2s4), 0));
    --is-2-greater-1-step-5: (1 - var(--is-1-greater-2-step-5));
  
    --arr1s5: calc(var(--is-2-greater-1-step-5) * var(--arr1s4) + var(--is-1-greater-2-step-5) * var(--arr2s4));
    --arr2s5: calc(var(--is-1-greater-2-step-5) * var(--arr1s4) + var(--is-2-greater-1-step-5) * var(--arr2s4)); 
    --arr3s5: var(--arr3s4);
    --arr4s5: var(--arr4s4);
    --arr5s5: var(--arr5s4);
    
    
    
    
    /* step 6 - check 2 and 3*/
    --is-2-greater-3-step-6: Min(1, Max(calc(var(--arr2s5) - var(--arr3s5)), 0));
    --is-3-greater-2-step-6: calc(1 - var(--is-2-greater-3-step-6));
  
    --arr1s6: var(--arr1s5);
    --arr2s6: calc(var(--is-3-greater-2-step-6) * var(--arr2s5) + var(--is-2-greater-3-step-6) * var(--arr3s5));
    --arr3s6: calc(var(--is-2-greater-3-step-6) * var(--arr2s5) + var(--is-3-greater-2-step-6) * var(--arr3s5)); 
    --arr4s6: var(--arr4s5);
    --arr5s6: var(--arr5s5);
    
    
    /* step 7 - check 3 and 4*/
    --is-3-greater-4-step-7: Min(1, Max(calc(var(--arr3s6) - var(--arr4s6)), 0));
    --is-4-greater-3-step-7: calc(1 - var(--is-3-greater-4-step-7));
  
    --arr1s7: var(--arr1s6);
    --arr2s7: var(--arr2s6);
    --arr3s7: calc(var(--is-4-greater-3-step-7) * var(--arr3s6) + var(--is-3-greater-4-step-7) * var(--arr4s6));
    --arr4s7: calc(var(--is-3-greater-4-step-7) * var(--arr3s6) + var(--is-4-greater-3-step-7) * var(--arr4s6)); 
    --arr5s7: var(--arr5s6);
    
    
    /* step 8 - check 1 and 2*/
    --is-1-greater-2-step-8: Min(1, Max(calc(var(--arr1s7) - var(--arr2s7)), 0));
    --is-2-greater-1-step-8: calc(1 - var(--is-1-greater-2-step-8));
  
    --arr1s8: calc(var(--is-2-greater-1-step-8) * var(--arr1s7) + var(--is-1-greater-2-step-8) * var(--arr2s7));
    --arr2s8: calc(var(--is-1-greater-2-step-8) * var(--arr1s7) + var(--is-2-greater-1-step-8) * var(--arr2s7)); 
    --arr3s8: var(--arr3s7);
    --arr4s8: var(--arr4s7);
    --arr5s8: var(--arr5s7);
    
    
      /* step 9 - check 2 and 3*/
    --is-2-greater-3-step-9: Min(1, Max(calc(var(--arr2s8) - var(--arr3s8)), 0));
    --is-3-greater-2-step-9: calc(1 - var(--is-2-greater-3-step-9));
  
    --arr1s9: var(--arr1s8);
    --arr2s9: calc(var(--is-3-greater-2-step-9) * var(--arr2s8) + var(--is-2-greater-3-step-9) * var(--arr3s8));
    --arr3s9: calc(var(--is-2-greater-3-step-9) * var(--arr2s8) + var(--is-3-greater-2-step-9) * var(--arr3s8)); 
    --arr4s9: var(--arr4s8);
    --arr5s9: var(--arr5s8);
    
    
     /* step 10 - check 1 and 2*/
    --is-1-greater-2-step-10: Min(1, Max(calc(var(--arr1s9) - var(--arr2s9)), 0));
    --is-2-greater-1-step-10: calc(1 - var(--is-1-greater-2-step-10));
  
    --arr1s10: calc(var(--is-2-greater-1-step-10) * var(--arr1s9) + var(--is-1-greater-2-step-10) * var(--arr2s9));
    --arr2s10: calc(var(--is-1-greater-2-step-10) * var(--arr1s9) + var(--is-2-greater-1-step-10) * var(--arr2s9)); 
    --arr3s10: var(--arr3s9);
    --arr4s10: var(--arr4s9);
    --arr5s10: var(--arr5s9);
    
    
    
    
    /* colouring divs */
    
    
    --color1: green;
    --color2: red;
    --switch1: var(--color1) calc(100% * var(--is-1-greater-2-step-1)), 
                 var(--color2) 0;
    
    --switch2: var(--color1) calc(100% * var(--is-2-greater-3-step-2)), 
                 var(--color2) 0;
    
    --switch3: var(--color1) calc(100% * var(--is-3-greater-4-step-3)), 
                 var(--color2) 0;
    
    --switch4: var(--color1) calc(100% * var(--is-4-greater-5-step-4)), 
                 var(--color2) 0;
    
     --switch5: var(--color1) calc(100% * var(--is-1-greater-2-step-5)), 
                 var(--color2) 0;
    
     --switch6: var(--color1) calc(100% * var(--is-2-greater-3-step-6)), 
                 var(--color2) 0;
    
    --switch7: var(--color1) calc(100% * var(--is-3-greater-4-step-7)), 
                 var(--color2) 0;
    
    --switch8: var(--color1) calc(100% * var(--is-1-greater-2-step-8)), 
                 var(--color2) 0;
    
     --switch9: var(--color1) calc(100% * var(--is-2-greater-3-step-9)), 
                 var(--color2) 0;
    
    --switch10: var(--color1) calc(100% * var(--is-1-greater-2-step-10)), 
                 var(--color2) 0;
    
/*     
    
    --val2s1: calc(var(--is-2-greater-1) * var(--val1) + var(--is-1-greater-2) * var(--val2));
    --val2s1: calc(var(--is-1-greater-2) * var(--val1) + var(--is-2-greater-1) * var(--val2));
     */
    
    
/*     
    
    --color1: red;
    --color2: green;
    --switch1: var(--color1) calc(100% * var(--is-1-greater-2)), 
                 var(--color2) calc(100% * var(--is-1-greater-2)), 
                 var(--color2) calc(100% * (1 - var(--is-1-greater-2)));
     */
    
    --anim-height: 20px;
    
    
}


.grid{
    display: flex;
    flex-direction: row;
    gap: 20px;
    align-items: end;
    padding: 20px;
    height: calc(var(--max-val) * var(--anim-height));
}

.grid div{
    background: linear-gradient(grey, grey); 
    width: 200px;
    animation-duration: 12s;
    animation-fill-mode: forwards;
}
.div1{
    height: calc(var(--arr1s0) * 20px);
    animation-name: div1;
}

.div2{
    height: calc(var(--arr2s0) * 20px);
    animation-name: div2;
}

.div3{
    height: calc(var(--arr3s0) * 20px);
    animation-name: div3;
}
.div4{
    height: calc(var(--arr4s0) * 20px);
    animation-name: div4;
}

.div5{
    height: calc(var(--arr5s1) * 20px);
    animation-name: div5;
}


@keyframes div1{
    0%{
       height: calc(var(--arr1s0) * var(--anim-height));
       background: linear-gradient(var(--switch1));
    }
    9%{
      background: linear-gradient(var(--switch1));  
    }
    10%{
       height: calc(var(--arr1s1) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    20%{
       height: calc(var(--arr1s2) * var(--anim-height));
    }
    30%{
       height: calc(var(--arr1s3) * var(--anim-height));
    }
    40%{
       height: calc(var(--arr1s4) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    41%{
       background: linear-gradient(var(--switch5));
    }
    49%{
       background: linear-gradient(var(--switch5));
    }
    50%{
       height: calc(var(--arr1s5) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    60%{
       height: calc(var(--arr1s6) * var(--anim-height));
    }
    70%{
       height: calc(var(--arr1s7) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    71%{
       height: calc(var(--arr1s7) * var(--anim-height));
        background: linear-gradient(var(--switch8));
    }
    79%{
       background: linear-gradient(var(--switch8));
    }
    80%{
       height: calc(var(--arr1s8) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    90%{
       height: calc(var(--arr1s9) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    91%{
       background: linear-gradient(var(--switch10));
    }
    99%{
      background: linear-gradient(var(--switch10));  
    }
    100%{
       height: calc(var(--arr1s10) * var(--anim-height));
       background: linear-gradient(grey, grey);  
    }
}
@keyframes div2{
    0%{
       height: calc(var(--arr2s0) * var(--anim-height));
       background: linear-gradient(var(--switch1));
    }
    10%{
       height: calc(var(--arr2s1) * var(--anim-height));
       background: linear-gradient(var(--switch1));
    }
    11%{
       height: calc(var(--arr2s1) * var(--anim-height));
       background: linear-gradient(var(--switch2));
    }
    19%{
       background: linear-gradient(var(--switch2));
    }
    20%{
       height: calc(var(--arr2s2) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    30%{
       height: calc(var(--arr2s3) * var(--anim-height));
    }
    40%{
       height: calc(var(--arr2s4) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    41%{
       height: calc(var(--arr2s4) * var(--anim-height));
       background: linear-gradient(var(--switch5));
    }
    49%{
       background: linear-gradient(var(--switch5));
    }
    50%{
       height: calc(var(--arr2s5) * var(--anim-height));
        background: linear-gradient(var(--switch6));
    }
    59%{
       background: linear-gradient(var(--switch6));
    }
    60%{
       height: calc(var(--arr2s6) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    70%{
       height: calc(var(--arr2s7) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    71%{
      background: linear-gradient(var(--switch8));  
    }
    80%{
       height: calc(var(--arr2s8) * var(--anim-height));
       background: linear-gradient(var(--switch8));
    }
    81%{
       height: calc(var(--arr2s8) * var(--anim-height));
       background: linear-gradient(var(--switch9));
    }
    90%{
       height: calc(var(--arr2s9) * var(--anim-height));
       background: linear-gradient(var(--switch9));  
    }
    91%{
       height: calc(var(--arr2s9) * var(--anim-height));
       background: linear-gradient(var(--switch10));
    }
    99%{
      height: calc(var(--arr2s10) * var(--anim-height));  
      background: linear-gradient(var(--switch10));  
    }
    100%{
       height: calc(var(--arr2s10) * var(--anim-height));
    }
}
@keyframes div3{
    0%{
       height: calc(var(--arr3s0) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    10%{
       height: calc(var(--arr3s1) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    11%{
      background: linear-gradient(var(--switch2));  
    }
    20%{
       height: calc(var(--arr3s2) * var(--anim-height));
       background: linear-gradient(var(--switch2));
    }
    21%{
       height: calc(var(--arr3s2) * var(--anim-height));
       background: linear-gradient(var(--switch3));
    }
    29%{
      background: linear-gradient(var(--switch3));  
    }
    30%{
       height: calc(var(--arr3s3) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    40%{
       height: calc(var(--arr3s4) * var(--anim-height));
    }
    50%{
       height: calc(var(--arr3s5) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    51%{
       height: calc(var(--arr3s5) * var(--anim-height));
       background: linear-gradient(var(--switch6));
    }
    59%{
       background: linear-gradient(var(--switch6));
    }
    60%{
       height: calc(var(--arr3s6) * var(--anim-height));
        background: linear-gradient(var(--switch7));
    }
    69%{
       background: linear-gradient(var(--switch7));
    }
    70%{
       height: calc(var(--arr3s7) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    80%{
       height: calc(var(--arr3s8) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    81%{
       background: linear-gradient(var(--switch9));
    }
    89%{
       background: linear-gradient(var(--switch9));
    }
    90%{
       height: calc(var(--arr3s9) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    100%{
       height: calc(var(--arr3s10) * var(--anim-height));
    }
}
@keyframes div4{
    0%{
       height: calc(var(--arr4s0) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    10%{
       height: calc(var(--arr4s1) * var(--anim-height));
    }
    20%{
       height: calc(var(--arr4s2) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    21%{
         background: linear-gradient(var(--switch3));
    }
    30%{
       height: calc(var(--arr4s3) * var(--anim-height));
       background: linear-gradient(var(--switch3)); 
    }
    31%{
       height: calc(var(--arr4s3) * var(--anim-height));
       background: linear-gradient(var(--switch4)); 
    }
    39%{
         background: linear-gradient(var(--switch4));
    }
    40%{
       height: calc(var(--arr4s4) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    50%{
       height: calc(var(--arr4s5) * var(--anim-height));
    }
    60%{
       height: calc(var(--arr4s6) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    61%{
       height: calc(var(--arr4s6) * var(--anim-height));
       background: linear-gradient(var(--switch7));
    }
    69%{
       background: linear-gradient(var(--switch7));
    }
    70%{
       height: calc(var(--arr4s7) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    80%{
       height: calc(var(--arr4s8) * var(--anim-height));
    }
    90%{
       height: calc(var(--arr4s9) * var(--anim-height));
    }
    100%{
       height: calc(var(--arr4s10) * var(--anim-height));
    }
}
@keyframes div5{
    0%{
       height: calc(var(--arr5s0) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    10%{
       height: calc(var(--arr5s1) * var(--anim-height));
    }
    20%{
       height: calc(var(--arr5s2) * var(--anim-height));
    }
    30%{
       height: calc(var(--arr5s3) * var(--anim-height));
       background: linear-gradient(grey, grey); 
    }
    31%{
         background: linear-gradient(var(--switch4));
    }
    39%{
         background: linear-gradient(var(--switch4));
    }
    40%{
       height: calc(var(--arr5s4) * var(--anim-height));
       background: linear-gradient(grey, grey);
    }
    50%{
       height: calc(var(--arr5s5) * var(--anim-height));
    }
    60%{
       height: calc(var(--arr5s6) * var(--anim-height));
    }
    70%{
       height: calc(var(--arr5s7) * var(--anim-height));
    }
    80%{
       height: calc(var(--arr5s8) * var(--anim-height));
    }
    90%{
       height: calc(var(--arr5s9) * var(--anim-height));
    }
    100%{
       height: calc(var(--arr5s10) * var(--anim-height));
    }
}
!

JS 

              
                // nothing to see here
!
999px

Console