index.css

body{
    position: absolute;
    top: 50%;  left: 50%;
    transform :  translateX(-50%) translateY(-50%)    translateZ(0);
    background-color: #1099bb;
  }
  #giris{
      display: flex;
  }
  #start{
      background-color: transparent;
      border: solid #2c3e50 5px;
      border-left: 0;
      width: 80px;
      cursor: pointer;
      opacity: 0;
      margin-right: 50px;
      animation: opacity 2s ease-out forwards;
      animation-delay: 1s;
  }
  #start svg {
    width: 50px;
    height: 50px;
    fill: #2C3E50;
    transform: rotate(-90deg);
    transition: all 0.5s;

  }
  img{
      animation: opacity 2s ease-out forwards; 
      opacity: 0;
  }
  #start svg:hover{
    fill: #fff;
    transform: rotate(0deg);
  }
  @keyframes opacity{
      0%{
        opacity: 0;
      }
      100%{
        opacity: 1;
      }
  }
  p{
      text-align: center;
      font-family: Tahoma, sans-serif;
      font-weight: bold;
      color: #fff
  }