.back-button {
    display: inline-block;
    margin-top: 5px;
    font-size: 18px;
    color: #333;
    background: #e6e6e6;
    padding: 10px 15px;
    border-radius: 6px;
    text-decoration: none;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
    width: 70px; 
    height: 20px;
    font-size: 18px;
  }
  
  .back-button:hover {
    background: #e0e0e0;
    color: #000;
  }

  .back-button2 {
    position: fixed;
    top: 480px; 
    left: 20px;
    font-size: 18px;
    color: #333;
  }

.container {
    background-color: rgb(217, 222, 215); 
    margin: 0 auto;
}

.block {
    position: absolute;
}

.background {
    width: 510px;
    height:410px;
    background-color: rgb(217, 222, 215); 
    left: 9px;
    top: 58px;
}

.block-gray1 {
    width: 195px;
    height: 45px;
    background-color: rgb(199, 203, 202);
    left: 9px;
    top: 58px;
}

.block-gray2 {
    width: 45px;
    height: 225px;
    background-color: rgb(199, 203, 202);
    left: 9px;
    top: 103px;
}

.block-lightgray {
    width: 115px;
    height: 335px;
    background-color: rgb(210, 214, 221);
    left: 54px;
    top: 103px;
}

.block-lightgray2 {
    width: 300px;
    height: 70px;
    background-color: rgb(210, 214, 221);
    left: 169px;
    top: 368px;
}

.block-lightblue {
    width: 120px;
    height: 85px;
    background-color: rgb(196, 216, 228);
    left: 169px;
    top: 103px;
}

.block-white {
    width: 120px;
    height: 120px;
    background-color: rgb(233, 242, 241);
    left: 169px;
    top: 188px;
}

.block-gray3 {
    width: 175px;
    height: 60px;
    background-color: rgb(199, 203, 202);
    left: 169px;
    top: 308px;
}

.block-blue {
    width: 55px;
    height: 205px;
    background-color: rgb(135, 168, 218);
    left: 289px;
    top: 103px;
}

.block-black {
    width: 65px;
    height: 120px;
    background-color: black;
    left: 344px;
    top: 208px;
}

.block-yellow {
    width: 83px;
    height: 40px;
    background-color: rgb(253, 234, 0);
    left: 344px;
    top: 328px;
}

.block-red {
    width: 42px;
    height: 40px;
    background-color: rgb(180, 56, 46);
    left: 427px;
    top: 328px;
}

.block-gray4 {
    width: 125px;
    height: 105px;
    background-color: rgb(205, 211, 211);
    left: 344px;
    top: 103px;
}

.block-gray5 {
    width: 60px;
    height: 120px;
    background-color: rgb(205, 211, 211);
    left: 409px;
    top: 208px;
}