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HTML 

              
                <div data-ng-app="App">
  <div class="architecture" data-ng-controller="base">
    <div class="row one">
      <div class="content">
        <div class="block title">
          FlexBox + Angular
        </div>
      </div>
      <div class="overlay">
        <div class="block">
          More Information
        </div>
      </div>
    </div>
    <div class="row two">
      <div class="content">
        <div class="block">
          Size two
        </div>
      </div>
      <div class="overlay">
        <div class="block">
          More Information..
        </div>
      </div>
    </div>
    <div class="row two">
      <div class="content columns">
        <div class="block" data-ng-click="remove($index, 'columns')" data-ng-repeat="cols in columns track by $index">
          {{cols}}
        </div>
        <div class="block add" data-ng-click="add('columns')">
          +
        </div>
      </div>
    </div>
    <div class="row one">
      <div class="content">
        <div class="block">
          Size one
        </div>
      </div>
      <div class="overlay">
        <div class="block">

        </div>
      </div>
    </div>
    <div class="row three columns">
      <div class="block">
        <div class="content rows">
          <div class="row multirows">
            <div class="block" data-ng-repeat="mini in minis track by $index" data-ng-click="remove($index, 'minis')">
              {{mini}}
            </div>
            <div class="block add" data-ng-click="add('minis')">
              +
            </div>
          </div>
        </div>
      </div>
      <div class="block">
        <div class="content rows">
          <div class="row">
            <div class="block">
              This is the first row
            </div>
          </div>
          <div class="row">
            <div class="block">
              This is the second row
            </div>
          </div>
        </div>
        <div class="overlay short">
          <div class="block">
            More info over both rows
          </div>
        </div>
      </div>
      <div class="block">
        <div class="content">
          <div class="block">
            Bigger block in size three row.
          </div>
        </div>
        <div class="overlay short">
          <div class="block">
            More info
          </div>
        </div>
      </div>
      <div class="block">
        <div class="content">
          <div class="block">
            Bigger block in size three row with more information on it here.
          </div>
        </div>
        <div class="overlay short">
          <div class="block">

          </div>
        </div>
      </div>
    </div>
    <div class="row one">
      <div class="content">
        <div class="block">
          Size one row
        </div>
      </div>
      <div class="overlay">
        <div class="block">
          More info
        </div>
      </div>
    </div>
    <div class="row" data-ng-repeat="row in rows track by $index" data-ng-class="row.size" data-ng-click="remove($index, 'rows')">
      <div class="content">
        <div class="block">
          {{row.number}}
        </div>
      </div>
    </div>
    <div class="row two">
      <div class="content columns">
        <div class="block add" data-ng-click="add('rows','one')">
          Add a size one row.
        </div>
        <div class="block add" data-ng-click="add('rows','two')">
          Add a size two row.
        </div>
        <div class="block add" data-ng-click="add('rows','three')">
          Add a size three row.
        </div>
      </div>
    </div>

  </div>
</div>
!

CSS 

              
                html, body {
  height: 100%;
}
body {
  background: #000A35;
  color: #000A35;
  height: 100%;
  font-family: 'Audiowide', sans-serif;
  >div{
    height: 100%;
  }
} 
.architecture {
  display: flex;
  flex-direction: column;
  height: 90%;
  box-sizing: border-box;
  margin:5% 5rem;
  border: 0.25rem solid rgba(255,255,255,0.9);
  .three {
    flex: 10 0 8rem;
  }
  .two {
    flex: 1 0 6rem;
  }
  .one {
    flex: 1 0 4rem;
  }
  .title {
    font-size: 2rem;
  }
  .row{
    background: rgba(84,182,219,1);
    flex-direction: row;
    position: relative;
    overflow: hidden;
    align-content: space-between;
    height: inherit;
    display: flex;
    .content {
      display: flex;
      flex-direction: column;
      align-self: stretch;
      width: 100%;
      .block {
        justify-content: center;
        align-items: center;
        flex-shrink: 0.5;
        margin: 0.25rem;
        padding: 2%;
        overflow: hidden;
        &.add {
          font-size: 1.4rem;
          font-style: bold;
          cursor: pointer;
          transition: all 0.25s ease;
          background: #0D7CC4;
          color: white;
          &:hover {
            color: white;
            background: #000A35;
          }
        }
      }
      .multirows {
        flex-wrap: wrap;
        .block{
          margin: 0.25rem;
          padding: 1rem;
          background: rgba(0,10,53,1);
          color: white;
          &.add{
            background: #0D7CC4;
          }
        }
        .row{
          margin: 0;
          flex: 1 0 5rem;
        }
      }
    }
    .block {
      background: rgba(0,10,53,1);
      color: white;
      padding: 1rem;
      margin: 0.25rem;
      display: flex;
      flex-direction: row;
      align-self: stretch;
      flex-grow: 1;
      position: relative;
      .content {
        display: flex;
        flex-direction: row;
        flex-grow: 1;
      }
      .rows {
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        .row {
          display: flex;
          flex-direction: row;
          justify-content: space-between;
        }
      }

    }
    .overlay {
      color: white;
      position: absolute;
      z-index: 5;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      opacity: 0;
      display: flex;
      flex-direction: column;
      transition: all 0.25s ease;
      &:hover {
        opacity: 1;
      }
      &.short{
        position: absolute;
        width: 100%;
      }
      .block {
        opacity: 1;
        align-items: center;
        justify-content: center;
        background: rgba(13,124,196, 0.9);
        margin: 0;
      }
    }
    &.columns, .columns {
      display: flex;
      flex-direction: row;
      align-content: stretch;
      justify-content: space-around;
      >.block {
        width: 25%;
        .rows {
          padding: 0;
        }
      }
    }
    &.columns > .block {
      padding: 0;
      .row {
        flex: 1 0 5rem;
        align-content: center;
        display: flex;
      }
    }
  }
}
!

JS 

              
                var app = angular.module("App", []);

app.controller("base", function($scope) {
  
  $scope.columns = [1,2,3,4];
  $scope.rows = [];
  $scope.minis = [1,2,3];
  
  $scope.add = function add(type, size){
    if(!type) return;
    var newValue;
    if(size){
      if($scope[type].length){
        var lastIndex = $scope[type].length - 1;
        var numb = $scope[type][lastIndex].number + 1;
        newValue = {
          number: numb,
          size: size
        }
      }else{
        newValue = {
          number: 1,
          size: size
        }
      }
    } else{
      if($scope[type].length){
        var lastIndex = $scope[type].length - 1;
        newValue = $scope[type][lastIndex] + 1;
      } else {
        newValue = 1;
      }
    }

    $scope[type].push(newValue);
  }
  $scope.remove = function remove(index, type){
    if(index == null || !type) return;
    $scope[type].splice(index, 1);
  }
  
  
});
!
999px

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