::selection {
          background: #505050;
        }

        ::-moz-selection {
          background: #505050;
        }

        html,
        body,
        .container {
          overflow: hidden;
          background-color: black;
          height: 100%;
        }

        .container {
          color: white;
          display: -webkit-flexbox;
          display: -ms-flexbox;
          display: -webkit-flex;
          display: flex;
          -webkit-flex-align: center;
          -ms-flex-align: center;
          -webkit-align-items: center;
          align-items: center;
          justify-content: center;
        }