* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family:'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif
}

.container {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #ececec;
    
}

.calculator {
    width: 300px;
    height: 440px;
    border-radius: 20px;
    background-color:lightcyan;
}

#screen-input,#display{
    font-size: 1.5rem;
    margin:30px 25px;
    height: 50px;
    width: 250px;
    border-radius: 10px;
    border: none;
    text-align: right;
    box-shadow:
    -7px -7px 15px rgb(255, 255, 255,0.65),
    7px 7px 15px rgb(70, 70, 70,0.12),
    inset -7px -7px 15px rgb(255, 255, 255,0.65),
    inset 7px 7px 15px rgb(70, 70, 70,0.12);
}
#screen-input,#display:focus{
    outline: none;
}
.btn {
    width: 50px;
    height: 50px;
    margin: 5px;
    box-shadow:
    -10px -10px 15px rgb(255, 255, 255,0.5),
    -10px 10px 15px rgb(70, 70, 70,0.12);
    border-radius: 12px;
    border: none;
    outline: none;
    cursor: pointer;
}

.btn:hover{
    box-shadow:
    -10px -10px 15px rgb(255, 255, 255,0.5),
    10px 10px 15px rgb(70, 70, 70,0.12),
    inset -10px -10px 15px rgb(255, 255, 255,0.5),
    inset 10px 10px 15px rgb(70, 70, 70,0.12);
}

.addition{
    height: 110px;
}
.cancel-btn{
  color: red;
  width: 115px;
}
.cancel-btn:hover{
    background-color:rgb(255, 227, 227);
}

.buttons{
    display: flex;
    justify-content: center;
}