.container {
 width: 60vw;
   border: 1px solid black;
  margin: auto;
  height: 60vh;
  text-align: center;
  background-color: #1452f5;
    color: white;
  border-radius: 0px;
  box-shadow: 10px 10px 5px grey;
}
#output {
 padding-top: 20%;
  font-family: arial;
  font-size: 30px;
}

#demo {
  width: 50%;
 border: none;
  background-color: transparent;
  color: white;
  caret-color: white;
}
input [type=number]::-webkit-inner-spin-button;
input [type=number]::-webkit-inner-spin-button {
-webkit-appearance: none;
margin: 0;
}
*:focus {
 outline: none; 
}

button {
 padding: 8px;
  width: 100px;
  border: none;
  border-radius: 20px;
  color: white;
  transition: all 0.5s;
}
.button span {
 cursor: pointer; 
  display: inline-block;
  position: relative;
  transition: 0.5s;
}
.button span:after {
 content: '\21E5';
  position: absolute;
  opacity: 0;
  top: 0;
  right: -20px;
   transition: 0.5% 
}
.button:hover span {
 padding-right: 25px;
}
.button:hover span:after {
 opacity: 1;
  right: 0;
}
#withdraw.button span:after {
 content: '\21E4'; 
  position: absolute;
  opacity: 0;
  top: 0;
  right: -20px;
  transition: 0.5s;
}
#withdraw.button:hover span:after {
 padding-right: 25px;
}
.withdraw.hover span:after {
  opacity: 1;
  right: 0;
}