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HTML

              
                <input id="trigger" class="toggle-checkbox" type="checkbox"><label for="trigger">Dance!</label>

<div class="z">
    <svg class="music" fill-rule="evenodd" stroke-linejoin="round" stroke-miterlimit="2" clip-rule="evenodd" viewBox="0 -100 244 396">
      <g transform="matrix(1.32759 0 0 1.27943 -5843 -177)">
        <g id="n3" class="musicnote"><path fill="#2f2f2f" fill-rule="nonzero" d="M202 103l4-23 2 1 3 1v1h1v1h1l5 1 1 1v1h1v2h1v1l1 1h1v2l-1-1v1h-4v-1h-2v-1h-4v1l-4-1v-1h-2l-3 19h-1l-1 2h-1v1h-1v1l-2-1v1h-3v-1l-2-1v-1h-1v-1h-1v-1h6v-1h2v-1h3v-1h-5v1h-1v-1l-2 1v-1l-2 1h-1v-2h1l1-2h1v-1h1v-1l2 1v-1h3v1l2 1v1h1z" transform="matrix(.75325 0 0 .7816 4397 135)"/></g>
        <g id="n6" class="musicnote"><path fill="#2f2f2f" fill-rule="nonzero" d="M18 28l2-23h3v1h2v1h2l-1 1h6v1h2l-1 2h2v2h1v1h1v1h1v1h-2l-1 1h-2v-1h-1v-1h-3v1l-2-1v1h-4l1-1h-2l-3 19h-1v2h-1v1h-1v1h-2l-1 1-3-1 1-1H8l1-1H8v-1H7v-1h2v-1h5v-1h1v-1h2v-1h-3v1H7l-1 1v-2h1l1-2h1v-1h1v-1h2v-1h3v1l2 1v1h1z" transform="matrix(.75325 0 0 .7816 4397 135)"/></g>
        <g id="n4" class="musicnote"><path fill="#2f2f2f" fill-rule="nonzero" d="M29 62l1-7h2l-1 13h-1l-1 2h-1v1h-1v1h-2v1h-3v-1h-2v-1l-1-1v-1h-1v-2h-1l1-3h1v-2h1v-1h1v-1h2v-1l3 1v1h2v1h1zm2-13l-1 6h-2l2-16h2v1h3v1h1v1h6v1h1v1h2l-1 2h1v1h2v1h1v1h-1v1h-4l-2-1h-4v1l-4-1h-2z" transform="matrix(.75325 0 0 .7816 4407 134)"/></g>
        <g id="n5" class="musicnote"><path fill="#2f2f2f" fill-rule="nonzero" d="M221 29h3v1l1-1v1h2v-1h6v1h1l1 2h1v1l2-1v1h1v1h-1v1h-1v1h-4l-1-1-2 1-2 1v1h-5l1 7 1-1 3 13h-1v2l-1 1v1h-1l1 1h-2v1l-3 1v-1h-2l-1-1h-1v-1h-1v-2l-1 1-1-3 1-1v-2h1v-1h1l-1-1h2v-1l3-1v1h2l1 1v-1l-1-6h-1l-3-16 2-1v1z" transform="matrix(.75325 0 0 .7816 4397 135)"/></g>
        <g id="n2" class="musicnote"><path fill="#2f2f2f" fill-rule="nonzero" d="M227 133l1-7h2l-1 13h-1v2h-1l-1 1-1 1h-2v1h-3v-1l-2-1v-1h-1v-1h-1l1-2h-1v-3h1v-2h1v-1h1v-1h2v-1l3 1v1h2v1h1zm2-14v7h-3l2-16h2l3 1v1h1v1h1v-1l5 1v1h1v1h2l-1 2h2l-1 1h2v1h1v1h-3v1h-2v-1h-2l-2-1v1h-6v-1h-2z" transform="matrix(.75325 0 0 .7816 4397 135)"/></g>
        <g id="n1" class="musicnote"><path fill="#2f2f2f" fill-rule="nonzero" d="M31 104l3 13h-1v2l-1 1v1h-1v1h-2v1l-3 1v-1h-2v-1h-1v-1h-1l-1-2h-1v-3h1v-2h1l-1-1h1v-1l2-1v-1h3v1h2l1 1v-1l-1-6 2-1zm-1-15l3-1v1h1v1h2v-1l4-1v1h2v1h1l1 2h1v1l1-1 1 1h1v1h-1v1h-2v1h-2v-1l-2 1v-1l-2 1-2 1-3 1v-1h-3m-1-9h-2l2 17 3-1-3-16z" transform="matrix(.75325 0 0 .7816 4392 143)"/></g>
        <g id="n7" class="musicnote"><path id="n7" fill="#2f2f2f" fill-rule="nonzero" d="M190 22l2 13h-1l1 2h-1v1h-1v1l-2 1v1h-3v-1l-2 1v-1h-1v-1h-1l-1-2-1 1v-3l1-1-1-2h1v-1h1v-1l2-1v-1h3v1l2-1v1h1l-2-7h3zm-3-16h3v1l2-1v1h1l4-1h2v1h2v2h1l1 1 1-1v1h1v1h-1v1h-1v1h-4v-1l-2 1-2 1v1h-6l2 7h-2l-4-16h2z" transform="matrix(.75325 0 0 .7816 4397 135)"/></g>
          
        </g></svg>

    <svg id="zombie" fill-rule="evenodd" stroke-linejoin="round" stroke-miterlimit="2" clip-rule="evenodd" viewBox="0 0 244 396"><g transform="matrix(1.32759 0 0 1.27943 -5843 -177)"><path fill="#676767" fill-rule="nonzero" d="M4445 258h91v36h-91z"/><path fill="#91c1a3" fill-rule="nonzero" d="M4473 244h35v21h-35z"/><path fill="#3a3a3a" fill-rule="nonzero" d="M4514 163h8v15h-62v-15h6v-7h48v7z"/><path fill="#9cd3b3" fill-rule="nonzero" d="M4515 178h7v14h14v22h-8v22h-6v7h-7v7h-14v8h-21v-8h-14v-7h-7v-7h-7v-22h-7v-22h14v-14h7v-7h49v7z"/><path fill="#fbeb8e" fill-rule="nonzero" d="M4494 185h23v22h-23zM4466 185h21v22h-21z"/><path fill="#758b7c" fill-rule="nonzero" d="M4480 229h8v7h-8z"/><path fill="#91c1a3" fill-rule="nonzero" d="M4487 200h7v21h-7z"/><path fill="#444445" fill-rule="nonzero" d="M4466 192h7v8h-7zM4501 185h7v7h-7z"/><path fill="#3a3a3a" fill-rule="nonzero" d="M4522 178h7v29h-7zM4452 178h7v29h-7z"/><path fill="#676767" fill-rule="nonzero" d="M4487 403h1v45h-55v-30h26v-45h28v30z"/><path fill="#9cd3b3" fill-rule="nonzero" d="M4459 396h29v7h-29z"/><path fill="#676767" fill-rule="nonzero" d="M4495 403v-30h29v45h25v30h-54v-45z"/><path fill="#9cd3b3" fill-rule="nonzero" d="M4524 396h-29v7h29z"/></g></svg>
<svg id="accord" fill-rule="evenodd" stroke-linejoin="round" stroke-miterlimit="2" clip-rule="evenodd" viewBox="0 0 244 396"><g transform="matrix(1.32759 0 0 1.27943 -5843 -177)">
    <g id="accordwrap"><g id="accordion"><path fill="#9e6330" d="M805 523l-81 29-101 28-78 19-103-10-102-30-95-8-57-11-75 593 96 38 96 25 118 19 121 16 102-24 109-32 116-4 68-36-78-613-56 1z" transform="matrix(.1864 0 0 .1934 4392 151)"/><path fill="#774b24" d="M-96 243h40v654h-40z" transform="matrix(.18627 .00697 -.00671 .19328 4491 216)"/><path fill="#774b24" d="M-96 243h40v654h-40z" transform="matrix(.1864 0 0 .1934 4507 218)"/><path fill="#774b24" d="M-96 243h40v654h-40z" transform="matrix(.18632 -.0055 .0053 .19333 4522 214)"/><path fill="#774b24" d="M-96 243h40v654h-40z" transform="matrix(.18622 -.00834 .00804 .19323 4539 209)"/><path fill="#774b24" d="M-96 243h40v654h-40z" transform="matrix(.18538 -.02015 .02012 .19931 4550 200)"/><path fill="#774b24" d="M-96 243h40v654h-40z" transform="matrix(.186 .01247 -.01201 .193 4473 212)"/><path fill="#774b24" d="M-96 243h40v654h-40z" transform="matrix(.18553 .01854 -.01787 .19251 4459 209)"/></g></g></g></svg>
      <svg id="zombiehands" fill-rule="evenodd" stroke-linejoin="round" stroke-miterlimit="2" clip-rule="evenodd" viewBox="0 0 244 396"><g transform="matrix(1.32759 0 0 1.27943 -5843 -177)">
    <g id="zright"><path fill="#676767" d="M986 743l21-4 14 69 9 75-32 91-59-193 47-38z" transform="matrix(-.18539 .02006 .01933 .19236 4575 132)"/><path fill="#9cd3b3" fill-rule="nonzero" d="M45 180h9v9h-9z" transform="matrix(.3357 -1.40534 .71215 .18316 4260 326)"/><path fill="#581610" d="M12 244l8-87h5l1-5h6v-5h6l1-5 6 1-17 184h-6l1-5-6-1v-5l-6-1 1-5-6-1 6-65z" transform="matrix(.75325 0 0 .7816 4397 135)"/><path fill="#9cd3b3" fill-rule="nonzero" d="M26 233l-1 9-20-2 3-35 20 2-1 8 9 1-2 18-8-1z" transform="matrix(.75325 0 0 .7816 4397 135)"/><path fill="#330d09" d="M940 740h21v186h-21z" transform="matrix(-.25064 -.0232 -.01853 .21552 4666 153)"/><path fill="#48120d" d="M940 740h21v186h-21z" transform="matrix(-.25064 -.0232 -.01322 .15371 4661 205)"/><path fill="#6b6108" d="M951 764h11v11h-11z" transform="matrix(-.18565 -.01725 -.01662 .19264 4604 161)"/><path fill="#6b6108" d="M951 764h11v11h-11z" transform="matrix(-.18565 -.01725 -.01662 .19264 4601 196)"/></g>
          <g id="zleft"><path fill="#676767" d="M993 733h13l15 75 9 75-44 104-47-206 54-48z" transform="matrix(.1864 0 0 .1934 4392 151)"/><path fill="#9cd3b3" fill-rule="nonzero" d="M45 180h9v9h-9z" transform="matrix(-.47435 -1.36163 -.69 .2588 4725 310)"/><path fill="#581610" d="M228 321l-27-176 6-1 1 5h5l1 5 6-1 1 5 6-1 13 89 9 55-6 2 1 5-6 1 1 5-6 1 1 5-6 1z" transform="matrix(.75325 0 0 .7816 4397 135)"/><path fill="#9cd3b3" fill-rule="nonzero" d="M223 216l-1-8 19-3 5 35-19 2-1-8-9 1-3-17 9-2z" transform="matrix(.75325 0 0 .7816 4397 135)"/><path fill="#330d09" d="M940 740h21v186h-21z" transform="matrix(.24863 -.04024 .03214 .21379 4308 171)"/><path fill="#48120d" d="M940 740h21v186h-21z" transform="matrix(.24863 -.04024 .02292 .15248 4316 222)"/><path fill="#6b6108" d="M951 764h11v11h-11z" transform="matrix(.18416 -.02986 .02878 .19109 4370 175)"/><path fill="#6b6108" d="M951 764h11v11h-11z" transform="matrix(.18416 -.02986 .02878 .19109 4376 209)"/></g></g>
    </svg>

</div>

<div class="logo"><a href="https://undead.institute" target="_blank"><img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/1804713/UndeadInsti-LogoOnWhite.png" alt="Getting Braaains should be fun"></a></div>
              
            
!

CSS

              
                #zombie, #accord, #zombiehands {
            width: 10vw;
            top: 6vw;
            left: 45vw;
            position: absolute;
            z-index: 10;
        }

        .music {
            width: 10vw;
            position: absolute;
            top: 2vw;
            left: 45vw;
            z-index: 10;
        }

        .toggle-checkbox:checked~.z .musicnote {
            animation: 4s ease-in-out calc(var(--multiplier) * 1s - 1s) notes forwards infinite;
        }

        .musicnote {
            width: 1vw;
            height: 2vw;
            opacity: 0;
        }

        #n1 {
            --multiplier: 1
        }

        #n2 {
            --multiplier: 1.2
        }

        #n3 {
            --multiplier: 1.4
        }

        #n4 {
            --multiplier: 1.6
        }

        #n5 {
            --multiplier: 1.8
        }

        #n6 {
            --multiplier: 2
        }

        #n7 {
            --multiplier: 2.2
        }

        @keyframes notes {
            /* Same movements and multiplier as explained in Cover Your Ears */
            0% {
                opacity: 0;
                transform: translateY(0);
            }

            30%,
            80% {
                opacity: 1;
            }

            100% {
                opacity: 0;
                transform: translateY(-2vw);
            }
        }

        .toggle-checkbox:checked~.z #zleft,
        .toggle-checkbox:checked~.z #zright {
            animation: 4s ease-in-out 0s play forwards infinite;
        }

        #zright {
            --multiplier: 1;
            transform-origin: 0 0;
            transform: translateX(0) rotate(0);
        }

        #zleft {
            --multiplier: -1;
            transform-origin: 0 0;
            transform: translateX(0) rotate(0);
        }

        @keyframes play {
            /* Makes the hands and sides of the accordion move in and out in a playing motion */
            0%,
            100% {
                transform: translateX(0) rotate(0);
            }

            50% {
                transform: translate(calc(var(--multiplier) * 30px), calc(var(--multiplier) * -160px)) rotate(calc(var(--multiplier) * 2deg));
            }
        }

        .toggle-checkbox:checked~.z #accordion {
/*            animation: 4s ease-in-out 0s squeeze forwards infinite;*/
        }

        .toggle-checkbox:checked~.z #accord{
            animation: 4s linear 0s squeeze forwards infinite;
        }
        #accordion, #accord {
            transform-origin: center center;
            transform: scaleX(1);
        }

        @keyframes squeeze {
            0%,
            100% {
                transform: scaleX(1);
            }

            50% {
                transform: scaleX(0.8);
            }
        }

        body {
            background-color: #DF96F1;
            overflow: hidden;
        }

        .logo {
            width: 100%;
            max-width: 400px;
            position: absolute;
            top: 0;
            right: 0;
        }

        .logo img {
            width: 100%;
        }

        input {
            display: none;
        }

        input:checked+label {
            box-shadow: inset 3px 3px 2px #660000;
            transform: translate(3px, 3px);
        }

        label {
            font-size: 1.5em;
            color: #FFF;
            background-color: #960B0B;
            width: 140px;
            height: 30px;
            text-align: center;
            font-weight: bold;
            display: block;
            border-radius: 7px;
            box-shadow: 3px 3px 0 #660000;
            cursor: pointer;
            position: relative;
            z-index: 1000;
        }
              
            
!

JS

              
                
              
            
!
999px

Console