title: safari calc() left issues
body: <p>I have a button, which is animated from right to the center of the page.</p>
  
  <p>In FF and Opera it functions well. In safari it goes to the mid of the page and then jumps back to the side.</p>
  
  <p>The button has the position</p>
  
  <pre><code>right:35px;
  width: 325px;
  </code></pre>
  
  <p>Then it is animated with the destination:</p>
  
  <pre><code>right: 50%;
  right: calc(50% - 325px/2);
  right: -webkit-calc(50% - 325px/2px);
  </code></pre>
  
  <p>I got the fallback, I got the -webkit, and still it jumps back to </p>
  
  <pre><code>right:35px;
  </code></pre>
  
  <p>I really don't know what is wrong here..The button has .class1 with position right:35px.... on click it changes the class to .class2 with the calc-position. So in css there is nothing about 35px from the right...I am confused.. </p>
  
  <p>EDIT:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>$("#konf-menu").click(function() {
    $(".konf-button").addClass('konf-animation').removeClass('line-right');
  });</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.konf-animation {
    position: fixed;
    visibility: visible;
    display: block;
    width: 325px;
    font-family: 'Dosis', sans-serif;
    letter-spacing: normal;
    font-weight: 400;
    text-transform: uppercase;
    text-decoration: none;
    text-align: center;
    font-size: 15px;
    -webkit-transform-origin: 100% 50%;
    -moz-transform-origin: 100% 50%;
    -ms-transform-origin: 100% 50%;
    -o-transform-origin: 100% 50%;
    transform-origin: 100% 50%;
    top: 50%;
    margin-top: -200px;
    -webkit-transition: all 0.7s;
    -moz-transition: all 0.7s;
    -ms-transition: all 0.7s;
    -o-transition: all 0.7s;
    transition: all 0.7s;
    z-index: 1006;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -ms-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
    top: calc(50% + 250px);
    right: 50%;
    right: calc(50% - 325px/2);
    right: -webkit-calc(50% - 325px/2);
    animation: konfi 1.8s;
    -moz-animation: konfi 1.8s;
    -webkit-animation: konfi 1.8s;
  }
  @keyframes konfi {
    0% {
      right: 0px;
    }
    90% {
      right: calc(45% -325px/2);
    }
    100% {
      right: calc(50% - 325px/2);
    }
  }
  .line-right {
    position: fixed;
    visibility: visible;
    display: block;
    width: 325px;
    font-family: 'Dosis', sans-serif;
    letter-spacing: normal;
    font-weight: 400;
    text-transform: uppercase;
    text-decoration: none;
    text-align: center;
    font-size: 15px;
    -webkit-transform: rotate(-90deg);
    -moz-transform: rotate(-90deg);
    -ms-transform: rotate(-90deg);
    -o-transform: rotate(-90deg);
    transform: rotate(-90deg);
    -webkit-transform-origin: 100% 50%;
    -moz-transform-origin: 100% 50%;
    -ms-transform-origin: 100% 50%;
    -o-transform-origin: 100% 50%;
    transform-origin: 100% 50%;
    right: 35px;
    top: 50%;
    margin-top: -200px;
    -webkit-transition: all 0.7s;
    -moz-transition: all 0.7s;
    -ms-transition: all 0.7s;
    -o-transition: all 0.7s;
    transition: all 0.7s;
    z-index: 1006;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js"&gt;&lt;/script&gt;
  &lt;a class=" link-underline menu-btn nav-link color-head konf hide-menu" href="#konfigurator" id="konf-menu"&gt;Konfigurator&lt;/a&gt;
  
  &lt;div class="line-right konf-button"&gt;
    &lt;div class="button-subscribe-wrap ex-modal-launcher konfig-btn"&gt;
      &lt;button class="button-subscribe navscroll"&gt;Angebotskonfigurator&lt;/button&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>EDIT2: This is the momentary code. Like I said, in FF, Opera it functions like it should. In Safari 9+ it goes to its destination, and then jumps back to some place on the right. I can't find the fault. Tried it with jquery, which is even more broke, also in FF and O..</p>