*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: url(R.jfif);
    background-size: cover;
}
.center{
    width: 500px;
    background: rgb(1, 30, 63);
    border: 5px solid whitesmoke;
    border-radius: 0.4vh;
}
input[type="button"]:hover{
    transition: .5s;
    background: violet;
   transition: all 4s ease;
  }
input[type="text"]{
    height: 60px;
    width: 470px;
    margin: 20px 10px 10px 10px;
   
    border-radius: 3px;
    border: 1px solid #e1e7ea;
    color: black;
    font-size: 22px;
    font-weight: bold;
    text-align: right;
    padding-right: 20px;
    background: linear-gradient(#d1dce0,#dfe6e9);
}
form .buttons{
    width: 450px;
    margin: 10px 25px 0 25px;
    padding: 10px 0;
}
input[type="button"]{
    width: 99px;
    height: 80px;
    margin: 5px;
    font-size: 22px;
    line-height: 55px;
    border-radius: 15px;
    border: 1px solid black;
    background: rgb(209, 201, 201);
  }

  input#clear{
    background: #de5c5c;
    border: 1px solid #cc0000;
    color: white;
  }
  input#equalto{
    width: 450px;
    margin: 10px 0 10px 0;
    font-size: 30px;
    color: white;
    background: #0059ff;
    border: 1px solid #60c5e7;
  }