#calc{
  border: 1px solid rgb(165, 163, 163);
  border-radius: 5px;
  width:200px;
  background-color: black;
}
#display{
  margin:10px;
  width: 165px;
  font-size: 60px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}
.button{
  width:50px;
  height:50px;
  margin:3px;
  background-color: blue;
  color: #fff;      
  font-weight: bold; 
  
}
#uni1{
  width: 106px;
}
.buttons{
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}
#uni{
  background-color: red;
}
#uni1{
  width: 106px;
}
#uni3{
  background-color: red;
}
#uni4{
  background-color: red;
}
#uni5{
  background-color: red;
}
#uni6{
  background-color: red;
}

@media (max-width: 500px) {
  #calc {
    width: 95vw;
    min-width: 180px;
    border-radius: 8px;
  }
  #display {
    width: 80vw;
    min-width: 120px;
    font-size: 8vw;
    margin: 10px auto;
    display: block;
  }
  .button {
    width: 22vw;
    height: 22vw;
    min-width: 40px;
    min-height: 40px;
    font-size: 6vw;
    margin: 2vw 1vw;
  }
  #uni1 {
    width: 44vw;
    min-width: 80px;
  }
  .buttons {
    justify-content: center;
    flex-wrap: wrap;
  }
}