style.css

@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&display=swap');
*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
      font-family: "Roboto", sans-serif;

}

*::after, *::before{
    box-sizing: border-box;
}

:root{
    --light-gray: #FAF7F0;
    --dark-gray: #D8D2C2;
    --brown: #B17457;
    --black: #4A4947;
}

body{
    background: white;
    display: grid;
    place-items: center;
    height: 100vh;
}

.container{
    width: 450px;
    height: 400px;
    background: rgba(211, 211, 211, .3);
    /* box-shadow: 5px 0 30px lightblue, -5px 0px 30px lightblue, 0 -5px 30 lightblue, 0 5px lightblue; */
    
}
.display-box{
   
    width: 100%;
    height: 110px;
    font-size: 30px;
    padding: 30px;
    /* background: #fff; */
    /* border-bottom: 1px solid black; */
    /* box-shadow: 0px 10px 0px lightblue; */
    margin-bottom: 30px;
   
}
.input-keys{
    user-select: none;
  display: flex;
  flex-wrap:  wrap;
  flex-direction:reverse;
  flex-shrink: none;
  
    

}

.key{
    width: 110px;
    height: 55px;
    /* background: var(--brown); */
    /* border: 1px solid red; */
    text-align: center;
    font-size: 30px;
    transition: all .1s ease-in-out;
}

.key:active{
    font-size: 25px;
}
@media (max-width:400px){
    .container{
        width: 250px;
    }

    .key{
        width: 62.5px;
    }
}