style.css

*{
    margin: 0px;
    padding: 0px;
    background-color: chocolate;

}

#container{
    position: absolute;
    top: 10%;
    left: 10%;
    border-radius: 10px;    
    border: 2px solid rgb(221, 219, 219); 
    background-color: rgb(224, 224, 224);
    box-shadow: 5px 5px 5px 0px rgba(0,0,0,.75);
   

}

#numbers{
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 5px;
    background-color: rgb(224, 224, 224);
}

.lines, #form {
    background-color: rgb(224, 224, 224);
}


#result{

    background-color: rgb(224, 224, 224);

    font-size: 20px;
    height: 25px;
    padding: 5px;
    color: rgb(68, 67, 67);
    width: 230px;
    margin: 10px;
    border-radius: 10px;     
    box-shadow: inset 0px 0px 99px -55px rgba(0,0,0,0.67);

}

.button , .eqbutton, .nbutton, .cbutton {

  background-color: rgb(58, 153, 248);
  color: white;
  width: 45px;
  text-align: center;
  line-height: 40px;
  font-size: 20px;
  border-radius: 10px;
  display: flex;
  justify-content: center;
  margin: 3px;
  cursor: pointer;


}

.eqbutton{
    line-height: 90px;
}


.nbutton{
    background-color: rgb(83, 88, 94); 
}


.cbutton{
   background-color: rgb(245, 114, 39);
}


#header {
    color: rgb(226, 225, 224);
    background-color: rgb(224, 224, 224);
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-weight: bold;  text-align: center;
    font-size: 17px;
    margin: 0px;
    margin-top: 8px;
    text-shadow: 1px 1px 3px  rgb(24, 25, 26);
}