<svg id="blimp" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 510 259">
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</svg>

:root {
  --dist: 1000;
  
}

svg#blimp {
  width: 10%;
  --dur: 1s;
  animation: fly var(--dur) cubic-bezier(.06,.29,.47,.86) both;
}


@keyframes fly {
  100% {transform: translateX(calc(var(--dist) * 1px));}
}

@media screen and (min-width: 700px) {
  svg#blimp {
    --dur: 2s;
  }
}

@media screen and (min-width: 1000px) {
    svg#blimp {
    --dur: 3s;
  }
}

@media screen and (min-width: 1500px) {
   svg#blimp {
    --dur: 4s;
  }
}

body {
  background: #AECDFF;
  margin: 3em 1em;
}
View Compiled 
var   width = window.innerWidth
|| document.documentElement.clientWidth
|| document.body.clientWidth;

var style = document.documentElement.style;
style.setProperty('--dist', width * .75);

// window.onresize = function(event) {
//   width = window.innerWidth
// || document.documentElement.clientWidth
// || document.body.clientWidth;
// };

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.