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HTML

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In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

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CSS

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CSS Base

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HTML 

              
                <!DOCTYPE html>
<html lang="fr">
<head>
  <title>Site en maintenance</title>
  <meta charset="utf-8">
  <link href="https://fonts.googleapis.com/css?family=Montserrat:300&display=swap" rel="stylesheet">
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>  
  <div class="container">
    <div class="d-flex align-center flex-column">
      <div class="col-L">
		<svg class="logo" x="0px" y="0px" viewBox="0 0 90 90">
		<g> <path class="color-white" d="M46.4,42.2c0.7,0,1.4-0.2,2-0.6l12.9-8.7l3.5-2.4L70,27l4.1-2.7c1.4-0.9,1.4-3,0-3.9L48.4,2.9 c-0.6-0.4-1.3-0.6-2-0.6s-1.4,0.2-2,0.6l-0.5,0.4L17.4,21.1c-1,0.7-1.6,1.8-1.6,3.1v3.5v4.9v10.3v10.3v13.5c0,1.2,0.6,2.4,1.6,3.1 l5.2,3.5c1.5,1,3.4-0.1,3.4-1.9V60.1V49.8v-3.4v-6.9V36c0-0.5,0.1-0.9,0.2-1.3c0.8-2.1,3.4-3.2,5.4-1.8l12.7,8.6 C44.9,42,45.6,42.2,46.4,42.2z M52.6,21.3l6.4-4.4c0.3-0.2,0.6-0.2,0.8-0.2s0.3,0.1,0.4,0.2l6.4,4.4c0.7,0.5,0.7,1.5,0,1.9 l-0.2,0.1l-6.3,4.2c-0.4,0.3-0.9,0.3-1.3,0l-6.4-4.4C51.9,22.7,51.9,21.7,52.6,21.3z"/> <path class="color-white" d="M74.2,60.3l-9.7,6.5L48.4,77.7c-0.6,0.4-1.3,0.6-2,0.6s-1.4-0.2-2-0.6l-4.9-3.3c-1.4-0.9-3.3,0.1-3.3,1.8v4.4 c0,1.2,0.6,2.4,1.6,3.1l6.6,4.4c0.6,0.4,1.3,0.6,2,0.6s1.4-0.2,2-0.6l21.9-14.8l5.7-3.8c0.6-0.4,1-1.1,1-1.9v-5.7 C76.9,60.3,75.3,59.5,74.2,60.3z"/> <path class="color-white" d="M73.1,35.2L48.5,51.8l-0.2,0.1c-0.6,0.4-1.3,0.6-2,0.6s-1.4-0.2-2-0.6l-3.8-2.6c-1.9-1.3-4.4,0.1-4.4,2.4v5 v3.2c0,1.2,0.6,2.4,1.6,3.1l6.6,4.4c0.6,0.4,1.3,0.6,2,0.6s1.4-0.2,2-0.6l9.3-6.3l0.7-0.5l6.4-4.3l4.5-3.1l6-4.1 c1-0.7,1.6-1.8,1.6-3.1v-3.2v-5.7C76.9,35.2,74.8,34.1,73.1,35.2z"/> </g>
		</svg>
        <h1>maintenance</h1>
        <h2>Nous effectuons actuellement une maintenance planifiée.</h2>
        <hr>
        <p>Nous espérons être de retour en ligne très prochainement. Merci de votre patience et nous nous excusons pour tout inconvénient causé.</p>        
      </div>
      <div class="col-R">   
		<svg  x="0px" y="0px"viewBox="0 0 219.9 219.9" style="enable-background:new 0 0 219.9 219.9;" > 
		<g>
		<path class="st0" d="M35.9,81.2c-2.6-4.4-1.7-10.4,1.2-14.6s7.6-7,12.4-9c5.4-2.2,11.4-3.5,17-2.1c7.8,1.9,13.5,8.5,20.4,12.6 c14.5,8.6,32.7,5.9,49.2,2.8c4.9-0.9,9.8-1.8,14.8-1.4c4.6,0.4,9.1,1.9,13.3,3.9c17.4,8,31,22.7,40.5,39.2 c4.4,7.7,8.1,16.3,7.9,25.2c-0.5,16.5-15.1,30.2-31.2,33.5c-16.1,3.4-33-1.8-47.3-10c-3.8-2.2-7.6-4.6-11.8-5.5 c-4.6-1-9.3-0.1-13.9,0.8c-5.5,1.1-11,2.1-16.2,4.3c-5.7,2.4-10.8,6-16.5,8.3c-11.5,4.6-24.5,3.2-36.4-0.3 c-6.8-2-13.5-4.7-19.1-9.1s-10-10.5-11.3-17.5c-1.7-9.9,3.8-20.6,12.8-25c4.6-2.2,9.8-2.9,14.1-5.7c4.7-3,7.7-8.5,7.8-14.1 S40.6,86.6,36,83.5"/> </g>
		<path class="st1" d="M128.5,120.4h-10.7c-0.1-0.9-0.2-1.6-0.2-1.6l-16-3.5c-3.4-6.9-0.8-16.7-0.8-16.7v-8.9l-6,9.8 c-2,13.6,2,20.9,2,20.9c4.2,9.4,5.5,17.4,5.8,22.7c0.5,6.9-0.4,12.5-2,23.8c-1.1,7.2-2.2,13.2-3.1,17.4l19.1-5.8l0.4-30.6 c1.1-1.2,3.2-4,4.1-8.1c1.1-5.3-0.7-9.5-1.4-11L128.5,120.4z"/>
		<path class="st2" d="M116.6,179.4l0.4-30.6c1.1-1.2,3.2-4,4.1-8.1c1.1-5.3-0.7-9.5-1.4-11l8.9-8.5"/> 
		<path class="st2" d="M93.7,99.5c-2,13.6,2,20.9,2,20.9c4.2,9.4,5.5,17.4,5.8,22.7c0.5,6.9-0.4,12.5-2,23.8 c-1.1,7.2-2.2,13.2-3.1,17.4"/>
		<path class="st3" d="M129.5,122.4h-25.8c-1.7,0-3-1.3-3-3V57.2c0-1.7,1.3-3,3-3h25.8c1.6,0,3,1.3,3,3v62.2 C132.5,121,131.1,122.4,129.5,122.4z"/> 
		<path class="st1" d="M102.3,123.8c1.6-2.8,2.3-5.9,3.5-7.5c0.5-0.7,2.1-3.9,5.5-6.8c3.5-2.9,4.9-5.8,5.3-5.9c5.4-1.5,4,6,1.5,8.3 c-1.8,1.7-2.3,2-3.9,4.3c-1.5,2.1-0.9,4.8-0.6,7.6c0.6,5.1,1.6,6.4,1.2,10.1c-0.2,2.3-1.2,4-2,5.2"/>
		<path class="st2" d="M102.3,123.8c1.6-2.8,2.3-5.9,3.5-7.5c0.5-0.7,2.1-3.9,5.5-6.8c3.5-2.9,4.9-5.8,5.3-5.9c5.4-1.5,4,6,1.5,8.3 c-1.8,1.7-2.3,2-3.9,4.3c-1.5,2.1-0.9,4.8-0.6,7.6c0.6,5.1,1.6,6.4,1.2,10.1c-0.2,2.3-1.2,4-2,5.2"/>
		<path class="st4" d="M162.2,183.7c-1.1-1.3-2.2-2.6-2.8-4.2c-0.6-1.6-0.8-3.4,0.1-4.9c1.1-2,3.8-3,4.2-5.2c0.3-1.9-1.3-3.7-1.1-5.7 c0.1-1.9,2-3.4,3.9-3.6c1.9-0.3,3.8,0.4,5.6,1.2c1.2,0.5,2.5,1.2,3.5,2.1c1.6,1.4,2.5,3.6,2.5,5.7c0,0.8-0.1,1.5-0.5,2.2 c-0.3,0.5-0.9,0.9-1.4,1.3c-2.3,1.4-5.3,1.8-6.8,4c-0.7,1.1-0.9,2.4-1.3,3.7c-0.8,2.2-2.7,4-4.9,4.7"/>
		<circle class="st5" cx="31.6" cy="99.5" r="2.6"/>
		<circle class="st6" cx="80.5" cy="182" r="2.6"/>
		<circle class="st6" cx="200.2" cy="82.7" r="2.6"/> 
		<path class="st7" d="M185,81c1.3-0.8,2.6-1.5,4-2.2c0.9-0.4,1.8-0.8,2.7-1.4c3.2-2.1,4.6-6.5,3.5-10.2c-1.1-3.7-4.6-6.5-8.4-7 c-3.8-0.5-7.8,1.1-10.3,4c-1.2,1.4-2.1,3.1-2.2,4.9c0,0.9,0.1,1.8-0.2,2.7c-0.5,1.1-1.7,1.6-2.7,2.1c-1.8,0.8-3.7,1.8-5.4,2.8 c-1.2,0.7-2.4,1.5-3,2.8c-0.7,1.6-0.1,3.5,0.4,5.2c0.6,2.2,1,4.6,0,6.6c-1,2-3,3.2-4.1,5.1c-0.9,1.7-1,3.7-0.8,5.5 c0.1,1,0.4,2.1,1.3,2.5c0.4,0.2,0.8,0.1,1.3,0c1.8-0.4,3.1-1.8,4.3-3.2c1-1.2,1.9-2.4,2.7-3.6c0.4-0.6,0.8-1.2,1.4-1.6 c0.6-0.4,1.4-0.5,2.2-0.5c2.3,0,4.9,0.4,6.8-1c1.5-1.1,2.1-3,2.1-4.8c0-1.8-0.4-3.6-0.7-5.4c-0.1-0.8-0.2-1.6,0.4-2.2 c0.3-0.3,0.7-0.4,1-0.6c1.2-0.4,2.5-0.7,3.8-0.8"/>
		<line class="st2 run" x1="189.2" y1="63.1" x2="156.3" y2="110.4"/> 
		<path class="st2 run" d="M193,76c-0.3-0.1-12.6-0.2-12.6-0.2"/>
		<line class="st2 run" x1="171.6" y1="88.4" x2="168.4" y2="75.6"/>
		<path class="st7" d="M73,49.4c-1.9-4.2-1.1-5-2.8-7.6c-1.9-2.9-4.1-3.6-3.8-4.9c0.3-1.1,2.1-1.8,3.6-1.8 c6.3-0.2,14.1,11.5,11.3,17.3c-0.7,1.5-2.3,3-3.8,2.8C75.6,55.1,74.3,52.2,73,49.4z"/>
		<path class="st2 run" d="M76.5,44.3c0,0,1.6,0.7,1.8,10.8"/> 
		<path class="st7" d="M41.2,164.7c-2-6.9-3.8-7.1-4.3-12c-0.6-5.4,1.2-8.5-0.5-9.7c-1.4-1.1-4.4,0-6.1,1.4c-7.8,6.1-5.3,28.1,4,32.2 c2.3,1,5.7,1.3,7.4-0.4C43.8,174,42.5,169.3,41.2,164.7z"/> 
		<path class="st2 run" d="M32,151c0,0-4.5,13.9,8.7,25.9"/> 
<path class="st3 rotate" d="M121.2,88.3c0-0.7,0.4-1.3,1.1-1.7c-0.1-0.4-0.3-0.8-0.5-1.1c-0.7,0.2-1.3-0.1-1.8-0.6
	c-0.5-0.5-0.7-1.1-0.5-1.8c-0.4-0.2-0.7-0.4-1.1-0.5c-0.4,0.7-1.1,1.1-1.8,1.1c-0.7,0-1.4-0.4-1.8-1.1c-0.4,0.1-0.8,0.3-1.1,0.5
	c0.2,0.7,0,1.3-0.5,1.8c-0.5,0.5-1.1,0.8-1.8,0.6c-0.2,0.4-0.4,0.7-0.5,1.1c0.7,0.4,1.1,0.9,1.1,1.7c0,0.7-0.4,1.4-1.1,1.8
	c0.1,0.4,0.3,0.8,0.5,1.1c0.7-0.2,1.3,0,1.8,0.5c0.5,0.5,0.7,1.1,0.5,1.8c0.4,0.2,0.7,0.4,1.1,0.5c0.4-0.7,1.1-1.1,1.8-1.1
	c0.7,0,1.4,0.4,1.8,1.1c0.4-0.1,0.8-0.3,1.1-0.5c-0.2-0.7,0-1.3,0.5-1.8c0.5-0.5,1.1-0.8,1.8-0.6c0.2-0.4,0.4-0.7,0.5-1.1
	C121.6,89.5,121.2,89,121.2,88.3 M116.6,90.2c-1.1,0-1.9-0.9-1.9-1.9c0-1.1,0.9-1.9,1.9-1.9c1.1,0,1.9,0.9,1.9,1.9
	C118.5,89.4,117.7,90.2,116.6,90.2"/>
		</svg>
      </div>
    </div>
  </div>
</body>
</html>
!

CSS 

              
                	body {
			background-color: #f5f5f5;font-family: 'Montserrat', sans-serif;
		}
		.d-flex {
			display:flex;
		}
		.align-center {
			align-items: center;			
		}
		.container {
			align-items: center;
			max-width: 90%;
		}
		.col-L {
			padding:2em;
		}
		.col-R {
			max-width: 50%;
			width:50%
		}	
		.color-white{fill:#FFFFFF;}	
		.logo {
		    height: 40px;
		    width: 40px;
		    font-size: .5em;
		    background-color: #ffcb1f;
			border-radius: 50%;
			padding: 1em;
			margin: 1em;		    
		}						
		h1 {
			margin: 0;
			font-size: 5vmax;
		    font-size: 36px;
		    font-size: 7vmin;
			color:rgba(0,0,0,.1);
		}	
		.st0{fill:#FFCB1E;}
		.st1{fill:#FFB8B8;}
		.st2,.st4,.st7 {
			stroke:#3F0E8C;
			stroke-miterlimit:10;
		}
		.st2{fill:none;}
		.st3{fill:#FFFFFF;stroke:#1D1D1B;stroke-width:0.9847;stroke-miterlimit:10;}
		.st4{
			fill:#00D292;
    	}
		.st5{fill:#00D292;}
		.st6{fill:#00CCCB;}
		.st7{fill:#00CCCB;}
		.st8{fill:none;stroke:#1D1D1B;stroke-width:0.9847;stroke-miterlimit:10;}	
		.st4,.st5,.st6{
			-webkit-animation: downMotion 8s ease-in-out infinite;
    		-moz-animation: downMotion 8s ease-in-out infinite;
    		animation: downMotion 8s ease-in-out infinite;
    	}	
		.st0{
			-webkit-animation: upMotion 10s ease-in-out infinite;
    		-moz-animation: upMotion 10s ease-in-out infinite;
    		animation: upMotion 10s ease-in-out infinite;
    	}
		.st7,.run{
			-webkit-animation: upMotion 6s ease-in-out infinite;
    		-moz-animation: upMotion 6s ease-in-out infinite;
    		animation: upMotion 6s ease-in-out infinite;
    	}
    	.rotate {
    		transform-origin: 116px 88px;
			-webkit-animation: 4s rotate infinite linear;
		    animation: 4s rotate infinite linear;
		}   		
 		@keyframes downMotion {
 			0% {transform: translate(0, -15px);}
 			50% {transform: translate(0, 0); }
 			100% {transform: translate(0, -15px);}
 		 }
 		@-webkit-keyframes downMotion {
 			0% {transform: translate(0, -15px);}
 			50% {transform: translate(0, 0); }
 			100% {transform: translate(0, -15px);}
 		 }
 		@-moz-keyframes downMotion {
 			0% {transform: translate(0, -15px);}
 			50% {transform: translate(0, 0); }
 			100% {transform: translate(0, -15px);}
 		 } 		  		 
 		@keyframes upMotion {
 			0% {transform: translate(0, 15px);}
 			50% {transform: translate(0, 0); }
 			100% {transform: translate(0, 15px);}
 		 } 
 		@-webkit-keyframes upMotion {
 			0% {transform: translate(0, 15px);}
 			50% {transform: translate(0, 0); }
 			100% {transform: translate(0, 15px);}
 		 }  
 		@-moz-keyframes upMotion {
 			0% {transform: translate(0, 15px);}
 			50% {transform: translate(0, 0); }
 			100% {transform: translate(0, 15px);}
 		 }   		 		 
		@keyframes rotate {100% {transform: rotate(360deg); } }
		@-webkit-keyframes rotate {100% {-webkit-transform: rotate(360deg); } }
		@-moz-keyframes rotate {100% {-webkit-transform: rotate(360deg); } } 
		@-o-keyframes rotate {100% {-webkit-transform: rotate(360deg); } }		 		 	
		@media only screen and (min-width: 992px) {
			.container {
				justify-content: center;
				height: calc(100vh - 16px);
				display: flex;
				flex-wrap: wrap;
			}			
			.col-L {
				width:40%;
				margin-right:10%;
			}
		}
		@media only screen and (max-width: 991px) {
			.flex-column {
				flex-direction: column;
			}
		}
!

JS
!
999px

Console