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HTML 

              
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		</linearGradient>
		<circle class="st21" cx="305.4" cy="306.2" r="60.9"/>
	</g>
	<g id="niveau-4_2_">
		<radialGradient id="SVGID_13_" cx="305.7076" cy="307.7213" r="65.0785" gradientUnits="userSpaceOnUse">
			<stop  offset="0.707" style="stop-color:#1C282E"/>
			<stop  offset="0.8068" style="stop-color:#25353D;stop-opacity:0.377"/>
			<stop  offset="0.8672" style="stop-color:#2C3F48;stop-opacity:0"/>
		</radialGradient>
		<circle class="st22" cx="305.7" cy="307.7" r="65.1"/>
		<linearGradient id="SVGID_14_" gradientUnits="userSpaceOnUse" x1="363.7548" y1="351.8787" x2="265.7548" y2="275.3787">
			<stop  offset="0" style="stop-color:#4F7282"/>
			<stop  offset="4.406451e-02" style="stop-color:#42606D"/>
			<stop  offset="9.674416e-02" style="stop-color:#38515C"/>
			<stop  offset="0.1624" style="stop-color:#314750"/>
			<stop  offset="0.2544" style="stop-color:#2D414A"/>
			<stop  offset="0.51" style="stop-color:#2C3F48"/>
			<stop  offset="0.6344" style="stop-color:#2E434C"/>
			<stop  offset="0.7669" style="stop-color:#364E59"/>
			<stop  offset="0.9027" style="stop-color:#43616E"/>
			<stop  offset="1" style="stop-color:#4F7282"/>
		</linearGradient>
		<circle class="st23" cx="305.4" cy="306.4" r="54.2"/>
	</g>
	<g id="niveau-3_2_">
		<radialGradient id="SVGID_15_" cx="305.7076" cy="307.7213" r="55.5206" gradientUnits="userSpaceOnUse">
			<stop  offset="0.707" style="stop-color:#2C3F48"/>
			<stop  offset="0.8465" style="stop-color:#2C3F48;stop-opacity:0"/>
		</radialGradient>
		<circle class="st24" cx="305.7" cy="307.7" r="55.5"/>
		<linearGradient id="SVGID_16_" gradientUnits="userSpaceOnUse" x1="270.894" y1="282.9889" x2="316.9879" y2="314.5487">
			<stop  offset="0" style="stop-color:#73D1D4"/>
			<stop  offset="1" style="stop-color:#21B6BB"/>
		</linearGradient>
		<circle class="st25" cx="305.5" cy="306.7" r="41.1"/>
	</g>
	<g id="niveau-2_2_">
		<radialGradient id="SVGID_17_" cx="305.7076" cy="307.7213" r="43.8604" gradientUnits="userSpaceOnUse">
			<stop  offset="0.707" style="stop-color:#2C3F48"/>
			<stop  offset="0.8672" style="stop-color:#2C3F48;stop-opacity:0"/>
		</radialGradient>
		<circle class="st26" cx="305.7" cy="307.7" r="43.9"/>
		<linearGradient id="SVGID_18_" gradientUnits="userSpaceOnUse" x1="355.0451" y1="345.4889" x2="271.5546" y2="280.3151">
			<stop  offset="0" style="stop-color:#4F7282"/>
			<stop  offset="4.406451e-02" style="stop-color:#42606D"/>
			<stop  offset="9.674416e-02" style="stop-color:#38515C"/>
			<stop  offset="0.1624" style="stop-color:#314750"/>
			<stop  offset="0.2544" style="stop-color:#2D414A"/>
			<stop  offset="0.51" style="stop-color:#2C3F48"/>
			<stop  offset="0.6344" style="stop-color:#2E434C"/>
			<stop  offset="0.7669" style="stop-color:#364E59"/>
			<stop  offset="0.9027" style="stop-color:#43616E"/>
			<stop  offset="1" style="stop-color:#4F7282"/>
		</linearGradient>
		<circle class="st27" cx="305.5" cy="306.8" r="35"/>
	</g>
	<g id="niveau-1_2_">
		<radialGradient id="SVGID_19_" cx="305.6337" cy="307.3514" r="17.03" gradientUnits="userSpaceOnUse">
			<stop  offset="0.6664" style="stop-color:#000000"/>
			<stop  offset="0.751" style="stop-color:#090D0F;stop-opacity:0.7334"/>
			<stop  offset="0.9118" style="stop-color:#202E35;stop-opacity:0.2263"/>
			<stop  offset="0.9836" style="stop-color:#2C3F48;stop-opacity:0"/>
		</radialGradient>
		<circle class="st28" cx="305.6" cy="307.4" r="17"/>
		<linearGradient id="SVGID_20_" gradientUnits="userSpaceOnUse" x1="293.3043" y1="298.9096" x2="309.7266" y2="310.1537">
			<stop  offset="0" style="stop-color:#73D1D4"/>
			<stop  offset="1" style="stop-color:#21B6BB"/>
		</linearGradient>
		<circle class="st29" cx="305.6" cy="307.4" r="14.6"/>
	</g>
</g>
<path id="fissure" class="st4" d="M295.7,312.8l5.8-0.9l1.9-4.7c0,0-0.1-1.2,0-1.2c0.1,0,0.2-2.6,0.2-2.6l0,0l-3.8-2.6l0.3-4.3
	l1,4.3l4,2.3l-0.1,0.7l0.3,0.2l1,1l1.3,1.1l-1.3,0.6l1.9,1.4l4.5-0.9l1.3,2.1l-1.4-1l-5.4,0.6l-1-1.3l-0.9-0.3c0,0-0.4,0.3-1.2,0.8
	l0,0l-0.1,0.3l-1.5,5.9L295.7,312.8z"/>
<g id="fleche">
	<linearGradient id="SVGID_21_" gradientUnits="userSpaceOnUse" x1="319.7925" y1="308.9414" x2="300.8294" y2="294.1385">
		<stop  offset="0" style="stop-color:#4F7282"/>
		<stop  offset="1.684505e-03" style="stop-color:#4E7181"/>
		<stop  offset="3.821087e-02" style="stop-color:#3E5A66"/>
		<stop  offset="7.966815e-02" style="stop-color:#314750"/>
		<stop  offset="0.1286" style="stop-color:#26383F"/>
		<stop  offset="0.1892" style="stop-color:#1F2E34"/>
		<stop  offset="0.2741" style="stop-color:#1B282D"/>
		<stop  offset="0.51" style="stop-color:#1A262B"/>
		<stop  offset="0.6107" style="stop-color:#1D2A2F"/>
		<stop  offset="0.7181" style="stop-color:#24353C"/>
		<stop  offset="0.8286" style="stop-color:#314851"/>
		<stop  offset="0.9404" style="stop-color:#43616F"/>
		<stop  offset="1" style="stop-color:#4F7282"/>
	</linearGradient>
	<path class="st30" d="M309.8,298.8c1.4,1.1,9.3,0.8,9.3,0.8l-7.3,3.2l-7.3,3.2l0.9-7.9l0.9-7.9, C306.3,289.9,308.5,297.7,309.8,298.8z"/>
	<linearGradient id="SVGID_22_" gradientUnits="userSpaceOnUse" x1="391.3389" y1="201.2179" x2="401.9222" y2="201.0513">
		<stop  offset="0" style="stop-color:#C0C6C8"/>
		<stop  offset="3.400026e-02" style="stop-color:#C1C8CB"/>
		<stop  offset="0.4741" style="stop-color:#D2E7E8"/>
		<stop  offset="0.7211" style="stop-color:#D9F2F3"/>
	</linearGradient>
	<polygon class="st31" points="376.3,216.4 389.9,215.9 425,185.7 397.6,188.9 	"/>
	<g>
		<g>
			<path class="st4" d="M394.7,193.4l22.2-3.1l-22.1,4.1c-0.2,0-0.5-0.2-0.5-0.4C394.4,193.8,394.4,193.4,394.7,193.4L394.7,193.4z"
				/>
		</g>
		<g>
			<path class="st4" d="M392.5,196.2l21.9-3.9l-21.7,4.8c-0.2,0-0.6,0-0.5-0.4C392.1,196.5,392.3,196.2,392.5,196.2L392.5,196.2z"/>
		</g>
		<g>
			<path class="st4" d="M390.4,198.9l20.2-3.6l-20,4.5c-0.2,0-0.6,0-0.5-0.4C390,199.2,390.2,198.9,390.4,198.9L390.4,198.9z"/>
		</g>
		<g>
			<path class="st4" d="M388.3,201.6l19.3-3.4l-19.1,4.3c-0.2,0-0.6,0-0.5-0.4S387.9,201.8,388.3,201.6L388.3,201.6z"/>
		</g>
		<g>
			<path class="st4" d="M386,204.5l17.2-2.9l-17.1,3.8c-0.2,0-0.6,0-0.5-0.4S385.8,204.5,386,204.5L386,204.5z"/>
		</g>
		<g>
			<path class="st4" d="M383.9,207.2l16.1-2.7l-16,3.7c-0.2,0-0.6,0-0.5-0.4S383.7,207.2,383.9,207.2L383.9,207.2z"/>
		</g>
		<g>
			<path class="st4" d="M381.8,209.9l14.8-2.4l-14.7,3.3c-0.2,0-0.6,0-0.5-0.4C381.2,210.3,381.4,209.9,381.8,209.9L381.8,209.9z"/>
		</g>
		<g>
			<path class="st4" d="M379.5,212.6l14.5-2.4l-14.3,3.3c-0.2,0-0.6,0-0.5-0.4C379.1,213,379.3,212.8,379.5,212.6L379.5,212.6z"/>
		</g>
		<g>
			<path class="st4" d="M377.4,215.4l16.1-2.7l-16,3.7c-0.2,0-0.6,0-0.5-0.4C377,215.7,377.2,215.5,377.4,215.4L377.4,215.4z"/>
		</g>
	</g>
	<linearGradient id="SVGID_23_" gradientUnits="userSpaceOnUse" x1="383.7607" y1="190.6879" x2="379.1774" y2="184.2712">
		<stop  offset="0" style="stop-color:#C0C6C8"/>
		<stop  offset="3.400026e-02" style="stop-color:#C1C8CB"/>
		<stop  offset="0.4741" style="stop-color:#D2E7E8"/>
		<stop  offset="0.7211" style="stop-color:#D9F2F3"/>
	</linearGradient>
	<polygon class="st32" points="370.8,210.5 367,197.9 385.8,155.7 390.4,182.7 	"/>
	<g>
		<g>
			<path class="st4" d="M386.8,187.4l-2.4-22.3l3.3,22.1c0,0.2-0.2,0.6-0.4,0.6C387,187.8,386.9,187.6,386.8,187.4L386.8,187.4z"/>
		</g>
		<g>
			<path class="st4" d="M384.7,190.2l-1.7-22.1l2.6,22.1c0,0.2-0.2,0.6-0.4,0.6S384.7,190.6,384.7,190.2L384.7,190.2z"/>
		</g>
		<g>
			<path class="st4" d="M382.7,193l-1.4-20.3l2.4,20.2c0,0.2-0.2,0.6-0.4,0.6C382.9,193.6,382.8,193.4,382.7,193L382.7,193z"/>
		</g>
		<g>
			<path class="st4" d="M380.8,195.9l-1.4-19.5l2.3,19.5c0,0.2-0.2,0.6-0.4,0.6C381.2,196.4,380.8,196.2,380.8,195.9
				C380.8,196,380.8,196,380.8,195.9z"/>
		</g>
		<g>
			<path class="st4" d="M378.6,198.9l-1.2-17.3l2.1,17.3c0,0.2-0.2,0.6-0.4,0.6C379,199.2,378.7,199.1,378.6,198.9L378.6,198.9z"/>
		</g>
		<g>
			<path class="st4" d="M376.7,201.7l-1.2-16.2l2.1,16.2c0,0.2-0.2,0.6-0.4,0.6C376.9,202.1,376.7,201.9,376.7,201.7L376.7,201.7z"
				/>
		</g>
		<g>
			<path class="st4" d="M374.7,204.5l-0.9-14.9l1.9,14.9c0,0.2-0.2,0.6-0.4,0.6C374.9,205.1,374.7,204.9,374.7,204.5L374.7,204.5z"
				/>
		</g>
		<g>
			<path class="st4" d="M372.6,207.3l-0.9-14.6l1.9,14.5c0,0.2-0.2,0.6-0.4,0.6S372.6,207.7,372.6,207.3L372.6,207.3z"/>
		</g>
		<g>
			<path class="st4" d="M370.6,210.3l-1.2-16.2l2.1,16.2c0,0.2-0.2,0.6-0.4,0.6C370.8,210.7,370.6,210.5,370.6,210.3L370.6,210.3z"
				/>
		</g>
	</g>
	<linearGradient id="SVGID_24_" gradientUnits="userSpaceOnUse" x1="360.5499" y1="245.4712" x2="347.1501" y2="235.0111">
		<stop  offset="0" style="stop-color:#4F7282"/>
		<stop  offset="1.684505e-03" style="stop-color:#4E7181"/>
		<stop  offset="3.821087e-02" style="stop-color:#3E5A66"/>
		<stop  offset="7.966815e-02" style="stop-color:#314750"/>
		<stop  offset="0.1286" style="stop-color:#26383F"/>
		<stop  offset="0.1892" style="stop-color:#1F2E34"/>
		<stop  offset="0.2741" style="stop-color:#1B282D"/>
		<stop  offset="0.51" style="stop-color:#1A262B"/>
		<stop  offset="0.6107" style="stop-color:#1D2A2F"/>
		<stop  offset="0.7181" style="stop-color:#24353C"/>
		<stop  offset="0.8286" style="stop-color:#314851"/>
		<stop  offset="0.9404" style="stop-color:#43616F"/>
		<stop  offset="1" style="stop-color:#4F7282"/>
	</linearGradient>
	<path class="st33" d="M309.1,298.5l81.3-116.8c1.8-2.5,5.3-3.2,7.8-1.4s3.2,5.3,1.4,7.8c-0.1,0.1-0.1,0.2-0.2,0.3l-88.5,111.5
		c-0.4,0.5-1.1,0.6-1.6,0.2C308.8,299.7,308.8,299,309.1,298.5z"/>
</g>
  </g>
</svg>
!

CSS 

              
                body {
  background-color: #cce5e3;
}

svg {
  width:30%;
  display:block;
  margin: 0 auto;
}

#fissure, #fleche, #_x34_-droite, #_x34_-gauche, #ombre-gauche, #ombre-droite {
  opacity:0;  
  }
  
  #_x34_-droite {
    -webkit-animation: bounceInRight 2s 1s ease-in forwards;
            animation: bounceInRight 2s 1s ease-in forwards;	}
  
  #ombre-droite {
    -webkit-animation: opacity 2s 2s ease-in forwards;
            animation: opacity 2s 2s ease-in forwards;	}
  
   #_x34_-gauche {
    -webkit-animation: bounceInLeft 2s 2s ease-in forwards;
            animation: bounceInLeft 2s 2s ease-in forwards;	}
 
    #ombre-gauche {
    -webkit-animation: opacity 2s 3s ease-in forwards;
            animation: opacity 2s 3s ease-in forwards;	}
  
  #cible_1_ {
    -webkit-animation: bounceInUp 2s ease-in forwards;
            animation: bounceInUp 2s ease-in forwards;	}
  
   #fissure {
    -webkit-animation: opacity .1s 4s ease-in forwards;
            animation: opacity .1s 4s ease-in forwards;	}
  
#fleche {
-webkit-animation: zoom 2s 2s ease-in forwards;
        animation: zoom 2s 2s ease-in forwards; }
  
  #target {
-webkit-animation: floating 8s ease-in-out infinite;
          animation: floating 8s ease-in-out infinite;  }
  
  @keyframes floating {
  0%, 100% {
    -webkit-transform: translate(0px, 2px) rotate(1deg);
            transform: translate(0px, 2px) rotate(1deg);
  }
  20% {
    -webkit-transform: translate(2px, 1px) rotate(2deg);
            transform: translate(2px, 1px) rotate(2deg);
  }
  40% {
    -webkit-transform: translate(0px, 2px) rotate(1deg);
            transform: translate(0px, 2px) rotate(1deg);
  }
  60% {
    -webkit-transform: translate(2px, -2px) rotate(2deg);
            transform: translate(2px, -2px) rotate(2deg);
  }
  80% {
    -webkit-transform: translate(0px, -1px) rotate(1deg);
            transform: translate(0px, -1px) rotate(1deg);
  }
}

@-webkit-keyframes zoom {

from {
  opacity:0;
-webkit-transform: scale(5) translate(200px, -2000px);
        transform: scale(5) translate(200px, -2000px);
}

to {
  opacity:1;
-webkit-transform: scale(1) translate(0px, 0px);
        transform: scale(1) translate(0px, 0px);
}
  }

@keyframes zoom {

from {
  opacity:0;
-webkit-transform: scale(5) translate(200px, -2000px);
        transform: scale(5) translate(200px, -2000px);
}

to {
  opacity:1;
-webkit-transform: scale(1) translate(0px, 0px);
        transform: scale(1) translate(0px, 0px);
}
  }
  
  @-webkit-keyframes opacity {

from {
  opacity:0;
}

to {
  opacity:1;
}
  }
  
  @keyframes opacity {

from {
  opacity:0;
}

to {
  opacity:1;
}
  }
  
  
  @-webkit-keyframes bounceInUp {
  from,
  60%,
  75%,
  90%,
  to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }

  from {
    opacity: 0;
    -webkit-transform: translate3d(0, 3000px, 0);
    transform: translate3d(0, 3000px, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(0, -20px, 0);
    transform: translate3d(0, -20px, 0);
  }

  75% {
    -webkit-transform: translate3d(0, 10px, 0);
    transform: translate3d(0, 10px, 0);
  }

  90% {
    -webkit-transform: translate3d(0, -5px, 0);
    transform: translate3d(0, -5px, 0);
  }

  to {
      opacity:1;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}
  
  
  @keyframes bounceInUp {
  from,
  60%,
  75%,
  90%,
  to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }

  from {
    opacity: 0;
    -webkit-transform: translate3d(0, 3000px, 0);
    transform: translate3d(0, 3000px, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(0, -20px, 0);
    transform: translate3d(0, -20px, 0);
  }

  75% {
    -webkit-transform: translate3d(0, 10px, 0);
    transform: translate3d(0, 10px, 0);
  }

  90% {
    -webkit-transform: translate3d(0, -5px, 0);
    transform: translate3d(0, -5px, 0);
  }

  to {
      opacity:1;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}

@-webkit-keyframes bounceInLeft {
  from,
  60%,
  75%,
  90%,
  to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }

  0% {
    opacity: 0;
    -webkit-transform: translate3d(-3000px, 0, 0);
    transform: translate3d(-3000px, 0, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(25px, 0, 0);
    transform: translate3d(25px, 0, 0);
  }

  75% {
    -webkit-transform: translate3d(-10px, 0, 0);
    transform: translate3d(-10px, 0, 0);
  }

  90% {
    -webkit-transform: translate3d(5px, 0, 0);
    transform: translate3d(5px, 0, 0);
  }

  to {
      opacity:1;

    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}

@keyframes bounceInLeft {
  from,
  60%,
  75%,
  90%,
  to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }

  0% {
    opacity: 0;
    -webkit-transform: translate3d(-3000px, 0, 0);
    transform: translate3d(-3000px, 0, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(25px, 0, 0);
    transform: translate3d(25px, 0, 0);
  }

  75% {
    -webkit-transform: translate3d(-10px, 0, 0);
    transform: translate3d(-10px, 0, 0);
  }

  90% {
    -webkit-transform: translate3d(5px, 0, 0);
    transform: translate3d(5px, 0, 0);
  }

  to {
      opacity:1;

    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}
  
  @-webkit-keyframes bounceInRight {
  from,
  60%,
  75%,
  90%,
  to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }

  from {
    opacity: 0;
    -webkit-transform: translate3d(3000px, 0, 0);
    transform: translate3d(3000px, 0, 0);
  }

  60% {
    opacity: 1;
    -webkit-transform: translate3d(-25px, 0, 0);
    transform: translate3d(-25px, 0, 0);
  }

  75% {
    -webkit-transform: translate3d(10px, 0, 0);
    transform: translate3d(10px, 0, 0);
  }

  90% {
    -webkit-transform: translate3d(-5px, 0, 0);
    transform: translate3d(-5px, 0, 0);
  }

  to {
      opacity:1;

    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}
  
  @keyframes bounceInRight {
  from,
  60%,
  75%,
  90%,
  to {
    -webkit-animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
    animation-timing-function: cubic-bezier(0.215, 0.61, 0.355, 1);
  }

  from {
    opacity: 0;
    -webkit-transform: translate3d(3000px, 0, 0);
    transform: translate3d(3000px, 0, 0);
  }
    
  60% {
    opacity: 1;
    -webkit-transform: translate3d(-25px, 0, 0);
    transform: translate3d(-25px, 0, 0);
  }

  75% {
    -webkit-transform: translate3d(10px, 0, 0);
    transform: translate3d(10px, 0, 0);
  }

  90% {
    -webkit-transform: translate3d(-5px, 0, 0);
    transform: translate3d(-5px, 0, 0);
  }

  to {
      opacity:1;

    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
}
!

JS 

              
                /*
  Inspired by: "Error, 404"
  By: Sujeet Mishra
  Link: https://dribbble.com/shots/4571035-Error-404
*/

var target = document.querySelector('#target');

document.addEventListener('mousemove', function (event) {
  var domainX = [0, document.body.clientWidth],
  domainY = [0, document.body.clientHeight],
  range = [-10, 10];

  var translate = {
    x: range[0] + (event.clientX - domainX[0]) * (range[1] - range[0]) / (domainX[1] - domainX[0]),
    y: range[0] + (event.clientY - domainY[0]) * (range[1] - range[0]) / (domainY[1] - domainY[0]) };


  target.style.animation = 'none';
  target.style.transform = 'translate(' + translate.x + 'px, ' + translate.y + 'px)';
});

document.addEventListener('mouseleave', function (event) {
  target.style.animation = 'floating 3s linear infinite';
});
!
999px

Console