Safari Bug without Vue

by blackoctopus0

HTML

<div id="app" class="app-layout"><div class="side-menu-header">
    Side Menu Header
  </div> <div class="side-menu">
    Side Menu
  </div> <div class="header">
     Header
  </div> <div class="messages"><div class="container"><div class="message-list"><div class="message">
           Learn JavaScript
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Learn Vue
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Play around in JSFiddle
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Build something awesome
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Check scrolling
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Works awesome on Safari 12.0
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Works awesome on Chrome
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Works awesome on Firefox
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Works awesome on Opera
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           But doesn't on Safari 12.1 &amp; 12.2...
           <span class="message-span"><button>
           click me
           </button></span></div><div class="message">
           Seems to be a display:none issue
           <span class="message-span"><button>
           click me
           </button></span></div><div...

CSS

body {
  background: #ffffff;
  padding: 20px;
  font-family: Helvetica;
  overflow: hidden;
}

.container {
  margin-top: auto;
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  width: 100%;
}

.app-layout {
  display: grid;
  height: 100vh;
  grid-template-columns: 100px 1fr;
  grid-template-rows: 60px 1fr;
}

.messages {
    grid-column: 2;
    grid-row: 2;
    padding: 0 1em;
    overflow-y: scroll;
    margin-bottom: 81px;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    width: 100%;
    -webkit-box-flex: 1;
    -ms-flex: 1;
    flex: 1;
    background-color: #ffffff;
    border-bottom: solid 1px #d1d2d4;
}

.message-list {
  height: 100%;
  padding: 15px;
}

.message {
  height: 30px;
}

.message-span {
  float: right;
  display: none;
}

.message:hover .message-span {
  display: block;
}

.side-menu-header {
    grid-column: 1;
    grid-row: 1;
    background-color: #f0f2f3;
    border-bottom: solid 1px #d1d2d4;
    position: relative;
}

.side-menu {
    grid-column: 1;
    grid-row: 2;
    overflow-y: auto;
    overflow-x: hidden;
    background-color: #f0f2f3;
}

.header {
  grid-column: 2;
  grid-row: 1;
  background-color: #f0f2f3;
  border-left: solid 1px #d1d2d4;
}

.footer {
  right: 0;
  left: 120px;
  bottom: 0;
  width: 100%;
  min-height: 63px;
  position: absolute;
}

.status-bar {
  font-size: 8px;
  right: 0;
  left: 120px;
  bottom: 63px;
  width: 100%;
  position: absolute;
  background-color: #ffffff;
  text-align: left;
  color: #8a8d93;
  padding-left: 50px;
  padding-bottom: 9px;
  padding-bottom: 5px;
  padding-top: 4px;
}