body {
    font-family: Arial, sans-serif;
    padding: 25px;
    background-color: white;
    color: black;
    font-size: 25px;
  }

  .dark-mode {
    background-color: #404040;
    color: white;
  }

  .note-container {
    background-color: #ffe77a;
    width: 600px;
    height: 600px;
    padding: 20px;
    border: 1px solid #f9d94a;
    margin: 50px auto;
    box-shadow: 0 2px 4px rgba(0, 1, 0, 1.1);
  }
  
  .note-content {
    width: 100%;
    height: 100%;
    resize: none;
    border: none;
    background: transparent;
    font-size: 16px;
  }
/*https://codepen.io/yuhomyan/pen/OJMejWJ*/
  .button {
    width: 130px;
    height: 40px;
    color: #141414;
    border-radius: 5px;
    padding: 10px 25px;
    font-family: 'Lato', sans-serif;
    font-weight: 500;
    background: transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    display: inline-block;
     box-shadow:inset 2px 2px 2px 0px rgba(255,255,255,.5),
     7px 7px 20px 0px rgba(0,0,0,.1),
     4px 4px 5px 0px rgba(0,0,0,.1);
    outline: none;
  }

  .btn-5 {
    width: 130px;
    height: 40px;
    line-height: 42px;
    padding: 0;
    border: none;
    background: rgb(255,27,0);
  background: linear-gradient(0deg, rgba(255,27,0,1) 0%, rgba(251,75,2,1) 100%);
  }
  .btn-5:hover {
    color: #f0094a;
    background: transparent;
     box-shadow:none;
  }
  .btn-5:before,
  .btn-5:after{
    content:'';
    position:absolute;
    top:0;
    right:0;
    height:2px;
    width:0;
    background: #f0094a;
    box-shadow:
     -1px -1px 5px 0px #fff,
     7px 7px 20px 0px #0003,
     4px 4px 5px 0px #0002;
    transition:400ms ease all;
  }
  .btn-5:after{
    right:inherit;
    top:inherit;
    left:0;
    bottom:0;
  }
  .btn-5:hover:before,
  .btn-5:hover:after{
    width:100%;
    transition:800ms ease all;
  }
  .btn-13 {
    background-color: #89d8d3;
  background-image: linear-gradient(315deg, #89d8d3 0%, #03c8a8 74%);
    border: none;
    z-index: 1;
  }
  .btn-13:after {
    position: absolute;
    content: "";
    width: 100%;
    height: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
    border-radius: 5px;
     background-color: #4dccc6;
  background-image: linear-gradient(315deg, #4dccc6 0%, #96e4df 74%);
    box-shadow:
     -7px -7px 20px 0px #fff9,
     -4px -4px 5px 0px #fff9,
     7px 7px 20px 0px #0002,
     4px 4px 5px 0px #0001;
    transition: all 0.3s ease;
  }
  .btn-13:hover {
    color: #fff;
  }
  .btn-13:hover:after {
    top: 0;
    height: 100%;
  }
  .btn-13:active {
    top: 2px;
  }
  .btn-14 {
    background: rgb(255,151,0);
    border: none;
    z-index: 1;
  }
  .btn-14:after {
    position: absolute;
    content: "";
    width: 100%;
    height: 0;
    top: 0;
    left: 0;
    z-index: -1;
    border-radius: 5px;
    background-color: #eaf818;
    background-image: linear-gradient(315deg, #eaf818 0%, #f6fc9c 74%);
     box-shadow:inset 2px 2px 2px 0px rgba(255,255,255,.5);
     7px 7px 20px 0px rgba(0,0,0,.1),
     4px 4px 5px 0px rgba(0,0,0,.1);
    transition: all 0.3s ease;
  }
  .btn-14:hover {
    color: #000;
  }
  .btn-14:hover:after {
    top: auto;
    bottom: 0;
    height: 100%;
  }
  .btn-14:active {
    top: 2px;
  }
  .btn-16 {
    border: none;
    color: #000;
  }
  .btn-16:after {
    position: absolute;
    content: "";
    width: 0;
    height: 100%;
    top: 0;
    left: 0;
    direction: rtl;
    z-index: -1;
    box-shadow:
     -7px -7px 20px 0px #fff9,
     -4px -4px 5px 0px #fff9,
     7px 7px 20px 0px #0002,
     4px 4px 5px 0px #0001;
    transition: all 0.3s ease;
  }
  .btn-16:hover {
    color: #000;
  }
  .btn-16:hover:after {
    left: auto;
    right: 0;
    width: 100%;
  }
  .btn-16:active {
    top: 2px;
  }
  .btn-12{
    position: relative;
    right: 20px;
    bottom: 20px;
    border:none;
    box-shadow: none;
    width: 130px;
    height: 40px;
    line-height: 42px;
    -webkit-perspective: 230px;
    perspective: 230px;
  }
  .btn-12 span {
    background: rgb(0,172,238);
  background: linear-gradient(0deg, rgba(0,172,238,1) 0%, rgba(2,126,251,1) 100%);
    display: block;
    position: absolute;
    width: 130px;
    height: 40px;
    box-shadow:inset 2px 2px 2px 0px rgba(255,255,255,.5),
     7px 7px 20px 0px rgba(0,0,0,.1),
     4px 4px 5px 0px rgba(0,0,0,.1);
    border-radius: 5px;
    margin:0;
    text-align: center;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    -webkit-transition: all .3s;
    transition: all .3s;
  }
  .btn-12 span:nth-child(1) {
    box-shadow:
     -7px -7px 20px 0px #fff9,
     -4px -4px 5px 0px #fff9,
     7px 7px 20px 0px #0002,
     4px 4px 5px 0px #0001;
    -webkit-transform: rotateX(90deg);
    -moz-transform: rotateX(90deg);
    transform: rotateX(90deg);
    -webkit-transform-origin: 50% 50% -20px;
    -moz-transform-origin: 50% 50% -20px;
    transform-origin: 50% 50% -20px;
  }
  .btn-12 span:nth-child(2) {
    -webkit-transform: rotateX(0deg);
    -moz-transform: rotateX(0deg);
    transform: rotateX(0deg);
    -webkit-transform-origin: 50% 50% -20px;
    -moz-transform-origin: 50% 50% -20px;
    transform-origin: 50% 50% -20px;
  }
  .btn-12:hover span:nth-child(1) {
    box-shadow:inset 2px 2px 2px 0px rgba(255,255,255,.5),
     7px 7px 20px 0px rgba(0,0,0,.1),
     4px 4px 5px 0px rgba(0,0,0,.1);
    -webkit-transform: rotateX(0deg);
    -moz-transform: rotateX(0deg);
    transform: rotateX(0deg);
  }
  .btn-12:hover span:nth-child(2) {
    box-shadow:inset 2px 2px 2px 0px rgba(255,255,255,.5),
     7px 7px 20px 0px rgba(0,0,0,.1),
     4px 4px 5px 0px rgba(0,0,0,.1);
   color: transparent;
    -webkit-transform: rotateX(-90deg);
    -moz-transform: rotateX(-90deg);
    transform: rotateX(-90deg);
  }
.btn-9 {
  border: none;
  transition: all 0.3s ease;
  overflow: hidden;
}
.btn-9:after {
  position: absolute;
  content: " ";
  z-index: -1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
   background-color: #1fd1f9;
background-image: linear-gradient(315deg, #1fd1f9 0%, #b621fe 74%);
  transition: all 0.3s ease;
}
.btn-9:hover {
  background: transparent;
  box-shadow:  4px 4px 6px 0 rgba(255,255,255,.5),
              -4px -4px 6px 0 rgba(116, 125, 136, .2), 
    inset -4px -4px 6px 0 rgba(255,255,255,.5),
    inset 4px 4px 6px 0 rgba(116, 125, 136, .3);
  color: #fff;
}
.btn-9:hover:after {
  -webkit-transform: scale(2) rotate(180deg);
  transform: scale(2) rotate(180deg);
  box-shadow:  4px 4px 6px 0 rgba(255,255,255,.5),
              -4px -4px 6px 0 rgba(116, 125, 136, .2), 
    inset -4px -4px 6px 0 rgba(255,255,255,.5),
    inset 4px 4px 6px 0 rgba(116, 125, 136, .3);
}