textarea{
    width: 100%;
    height: 75vh;
    margin-bottom: 20px;
    padding: 20px;
    box-sizing: border-box;
}
.wapper{
    margin: 0 auto;
    max-width: 95%;
}
h1.center{
  padding-top: 33px;
  text-align: center;
  display: flex;
  align-content: center;
  align-items: center;
  text-transform: uppercase;
  justify-content: center;
}
button{
    width: 100px;
    height: 30px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    width: 200px;
}
select{
    height: 30px;
  width: 200px;
  margin-bottom: 15px;
  padding: 0 10px;
}
#json_format{
    margin-bottom: 15px;
}
#container{
   display: flex;
}
.left,
.right{
    width: 40%;
}
.center{
    padding-top: 33px;
    text-align: center;
    display: flex;
    align-content: center;
    align-items: center;
}
.old-number,
.new-number{
    float: right;
}