*{
    margin: 0;
    padding: 0;

}
body{
    display: flex;
    background-color: rgb(139, 187, 187);
    width: 100%;
    height: 100vh;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
section{
    background-color: black;
    color: aliceblue;
    width: 240px;
    height: 405px;
    margin: 0px 20px;
    padding: 20px;
    border-radius: 10PX;
    box-shadow: 4px 8px 15px  rgba(0,0,0,0.8  ); 
}
h1{
    text-align: center;
}
input{
    width: 84%;
    padding: 15px;
    color: rgb(71, 71, 71);
    outline: none;
    border-radius: 5px;
    margin-top: 5px;
    font-size: 30px;
    text-align: right ;
    box-shadow: 4px 8px 15px inset rgba(0,0,0,0.9 );
    font-weight: bold;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.num{
    display: grid;
    grid-template-columns: repeat(4,62px);
}
button{
    width: 50px;
    height: 50px;
    border-radius: 50px;
    margin: 5px 2px;
    font-size: 20px;
    font-weight: bolder;
    box-shadow: 4px 8px 15px inset rgba(0,0,0,0.5 );
}
.equal{
    width: 111px;
    background-color: rgb(0, 255, 255);
}
.del{
    background-color: rgb(243, 4, 4);
}
span{
    font-size: 12px;
    color: rgb(143, 140, 140);
    
}
.clear{
    background-color: yellow;
}
.opretar{
    background-color: rgb(4, 252, 4);
}