#installFab {
 position: fixed;
 bottom: 25px;
 right: 25px;
 width: 62px;
 height: 62px;
 background: #1a8f3f;
 color: #fff;
 border-radius: 50%;
 display: none;
 font-size: 32px;
 align-items: center;
 justify-content: center;
 text-align: center;
 cursor: pointer;
 z-index: 9999;
 box-shadow: 0 4px 16px rgba(0,0,0,0.25);
}