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HTML 

              
                <div class="container">
            
  <div class="content">

    <!-- top container -->
    <div class="inner-wrapper">
      <div class="top-title">Oh!</div>

      <div class="main-title">
        4
        <span class="svg-wrap">
          <svg width="80px" height="80px" viewBox="0 0 40 42" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:sketch="http://www.bohemiancoding.com/sketch/ns">
            <title>Lego head</title>
            <defs>
              <path id="path-1" d="M14.00976,6.04673974 C15.1748273,5.5908863 16,4.45702525 16,3.13043478 C16,1.40154339 14.5984566,0 12.8695652,0 C12.0080647,0 11.2278445,0.348002376 10.6618113,0.911100458 C10.5772973,0.939953572 10.4903214,0.971146886 10.4008152,1.00475543 C5.57957133,2.8150777 4.24944679,0.347826087 3.13043478,0.347826087 C1.40154339,0.347826087 0,1.74936948 0,3.47826087 C0,5.20715226 1.40154339,6.60869565 3.13043478,6.60869565 C4.46967336,6.60869565 12.3802688,6.97312235 14.00976,6.04673974 L14.00976,6.04673974 Z"></path>
            </defs>
            <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" sketch:type="MSPage">
              <g id="Lego-head" sketch:type="MSLayerGroup" transform="translate(1.000000, 1.000000)">
                <g id="Lego">
                  <g id="404-Page">
                    <g id="Group">
                      <g id="Lego-head">
                        <rect id="head-bottom" stroke="#D8B140" stroke-width="2" fill="#F4CD3B" sketch:type="MSShapeGroup" x="9" y="29" width="20" height="11" rx="2"></rect>
                        <rect id="head-top" stroke="#D8B140" stroke-width="2" fill="#F4CD3B" sketch:type="MSShapeGroup" x="11" y="0" width="16" height="11" rx="2"></rect>
                        <rect id="head" stroke="#D8B140" stroke-width="2" fill="#F4CD3B" sketch:type="MSShapeGroup" x="0" y="4" width="38" height="32" rx="8"></rect>
                        <g id="mouth" transform="translate(11.000000, 23.000000)">
                          <g id="mask-2" fill="#FFFFFF" sketch:type="MSShapeGroup">
                            <path d="M14.00976,6.04673974 C15.1748273,5.5908863 16,4.45702525 16,3.13043478 C16,1.40154339 14.5984566,0 12.8695652,0 C12.0080647,0 11.2278445,0.348002376 10.6618113,0.911100458 C10.5772973,0.939953572 10.4903214,0.971146886 10.4008152,1.00475543 C5.57957133,2.8150777 4.24944679,0.347826087 3.13043478,0.347826087 C1.40154339,0.347826087 0,1.74936948 0,3.47826087 C0,5.20715226 1.40154339,6.60869565 3.13043478,6.60869565 C4.46967336,6.60869565 12.3802688,6.97312235 14.00976,6.04673974 L14.00976,6.04673974 Z" id="path-1"></path>
                          </g>
                          <g id="Mask" fill="#3D3D3D" sketch:type="MSShapeGroup">
                            <path d="M14.00976,6.04673974 C15.1748273,5.5908863 16,4.45702525 16,3.13043478 C16,1.40154339 14.5984566,0 12.8695652,0 C12.0080647,0 11.2278445,0.348002376 10.6618113,0.911100458 C10.5772973,0.939953572 10.4903214,0.971146886 10.4008152,1.00475543 C5.57957133,2.8150777 4.24944679,0.347826087 3.13043478,0.347826087 C1.40154339,0.347826087 0,1.74936948 0,3.47826087 C0,5.20715226 1.40154339,6.60869565 3.13043478,6.60869565 C4.46967336,6.60869565 12.3802688,6.97312235 14.00976,6.04673974 L14.00976,6.04673974 Z" id="path-1"></path>
                          </g>
                          <g id="Oval-25-Clipped">
                            <mask id="mask-2" sketch:name="path-1" fill="white">
                              <use xlink:href="#path-1"></use>
                            </mask>
                            <g id="path-1"></g>
                            <path d="M2.90917969,7.67480469 C5.90917969,9.95019531 8.99755822,7.576474 8.99755822,6.74804688 C8.99755822,5.91961975 6.209139,4 4,4 C1.790861,4 2.8444044e-16,4.67157288 2.8444044e-16,5.5 C2.8444044e-16,6.32842712 -0.0908203125,5.39941406 2.90917969,7.67480469 L2.90917969,7.67480469 Z" id="Oval-25" fill="#EA6767" sketch:type="MSShapeGroup" mask="url(#mask-2)"></path>
                          </g>
                        </g>
                        <circle id="e-r" fill="#3D3D3D" sketch:type="MSShapeGroup" cx="13.5" cy="18.5" r="2.5"></circle>
                        <circle id="e-l" fill="#3D3D3D" sketch:type="MSShapeGroup" cx="22.5" cy="18.5" r="2.5"></circle>
                        <path d="M9,15.7883986 C9,15.7883986 11.0517578,11.8870314 13.6416016,13.3137892" id="e-l" stroke="#3D3D3D" sketch:type="MSShapeGroup" transform="translate(11.320801, 14.394199) scale(-1, -1) translate(-11.320801, -14.394199) "></path>
                        <path d="M26.6416016,15.7883986 C26.6416016,15.7883986 24.5898438,11.8870314 22,13.3137892" id="e-r" stroke="#3D3D3D" sketch:type="MSShapeGroup" transform="translate(24.320801, 14.394199) scale(-1, -1) translate(-24.320801, -14.394199) "></path>
                      </g>
                    </g>
                  </g>
                </g>
              </g>
            </g>
          </svg>
        </span>
        4
      </div>
    </div>

    <!-- bottom-tagline -->
    <p class="blurb">
      The page you were looking for doesn't exist.<br/>
      Return to  
      <a href="#">homepage</a> 
      or explore
    </p>

    <a href="#" class="lego-btn">Lego World</a>

  </div>

</div>
!

CSS 

              
                /* ==========================================================================
   Base Styles - ! HTML5 Boilerplate v5.0 | MIT License | http://h5bp.com/ 
   ========================================================================== */

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

::-moz-selection {
  background: #b3d4fc;
  text-shadow: none;
}

::selection {
  background: #b3d4fc;
  text-shadow: none;
}

a{
  color: #4384F5;
  text-decoration: none;
}

a:hover{
  opacity: 0.8;
}

svg {
  vertical-align: middle;
}


/* ==========================================================================
   Main Styles
   ========================================================================== */

.container {
  display: table;
  font-family: 'Open Sans', sans-serif;
  height: 100%;
  width: 100%;
  background: #fff;
}

.content{
  display: table-cell;
  font-size: 22px;
  text-align: center;
  vertical-align: middle;
  padding: 40px 30px;
}

.inner-wrapper{
  display: inline-block;
}

.top-title{
  color: #4384F5;
  font-size: 35px;
  font-weight: 700;
  margin-bottom: 25px;
}

.main-title{
  line-height: 0;
  font-size: 90px;
  font-weight: 800;
  color: #4384F5;
}

.svg-wrap{
  display: inline-block;
  font-size: 0;
  vertical-align: super;
}

#lego{
  padding: 5px;
}

.blurb{
  margin-top: 30px;
  color: #B6BECC;
}

.lego-btn{
  background: #4384F5;
  border-radius: 4px;
  color: #fff;
  display: inline-block;
  margin-top: 30px;
  padding: 12px 25px;
}

/* ==========================================================================
   Media Queries
   ========================================================================== */



@media only screen and (max-width: 440px){

  .main-title{
    font-size: 60px;
  }

  #lego{
    width: 50px;
    height: 55px;
    padding: 10px 5px;
  }
  
  .blurb,
  .lego-btn{
    font-size: 18px;
  }


}
!

JS
!
999px

Console