* {
  box-sizing: border-box;
  margin: 0;
  user-select: none;
  font-family: Verdana;
}

.calculator {
  margin: 10px 10% 10px 10%;
  border-radius: 12px;
  width: 75%;
  height: 95%;
  font-size: 20px;
  padding: 0;
  background-color: #161a3d;
  position: relative;
  z-index: 0;
}
.screen-board {
  height: 30%!important;
  width: 100%;
  background-color: #161a2d;
  border-top-right-radius: inherit;
  border-top-left-radius: inherit;
  position: relative;
}
.ans-type {
  position: absolute;
  right: 5px;
  top: 7px;
  font-size: 12px!important;
  padding: 8px 16px;
  border-radius: 12px;
  border: none;
  opacity: 0.4;
  color: #fff;
  font-weight: 500;
}
#querry, #result {
  font-family: Verdana;
  width: 100%;
  color: #fff;
  overflow: auto;
  white-space: nowrap;
  /* width: 384px; */
  height: 109.71px;
}
#querry {
  text-align: left;
  font-weight: bold;
  font-size: 30px;
  padding: 24px;
}
#result {
  font-size: 45px;
  text-align: right;
  font-weight: bolder;
  padding: 16px;
}
.input-board {
  height: 485px;
  padding: 10px;
  border-top: #fff 1px solid;
  margin-left: 5px;
}
.button {
  /*width: 20%;
  height: 100%;*/
  width: 70px;
  height: 70px;
  padding: 24px 24px;
  margin: 5px;
  border: none;
  border-radius: 5px;
  font-weight: bold;
  font-size: 25px;
}

.fx-board {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 20px;
  background-color: #555;
  border-radius: 12px;
  z-index: 1;
  transition: 0.4s;
}
.fx-caret i {
  color: #000;
}
.fx-board div {
  display: none!important;
}

.fx-board:hover div {
  display: block;
}
.control {
  background-image: linear-gradient(to right, #609, #426, #248);
  color: #fff;
}
.fx-button {
  width: 20%;
  margin: 5px;
  padding: 4px 8px;
  height: 49.33px;
  font-size: 25px;
  border: none;
  border-radius: 5px;
  white-space: nowrap;
}
.fx-board .button-row {
  margin-left: 10px;
}
.fx-board .button-row button {
  font-weight: bold;
}
sup {
  font-size: 10px;
  font-weight: bold;
}
.fx-caret {
  text-align: center;
  width: 100%;
  color: #fff;
}
.fx-caret:hover {
  color: #f1f1f1;
}
.fx-board .fx-caret i {
  transform: rotate(180deg);
  font-size: 20px;
  transition: .6s;
}

#__ {
  margin-left: 5px;
}
.fx-display {
  height: 70%;
  background-color: #161a3d;
  border-top: #fff 1px solid;
}
.fx-display .fx-caret i {
  transform: rotate(0deg);
  color: #fff;
}
.fx-display div {
  display: block!important;
  animation: waiting 1.2s;
}
@keyframes waiting {
  from {opacity: 0;}
  to {opacity: 1;}
}

#equals {
  background-image: linear-gradient(to right, #001245, #009);
  color: #fff;
}

/* ---------------
media querry for pc 
---------------- */
@media screen and (min-width: 500px) {
  body {
    display: flex;
    justify-content: center;
  }
  .button-row, .equals {
    margin-left: 5%;
  }
  /* #equals {
    width: 44%;
  } */
  .calculator {
    width: 45%;
    margin: 25% 0 0 0;
    height: 50%;
  }
  .fx-board .button-row {
    margin-left: 7%;
  }
}
/* media query for phones */
@media screen and (max-width: 450px) {
  .calculator {
    width: 100%;
    height: 100%;
    margin: 0;
    border-radius: 0;
  }
  .button-row, .equals {
    margin-left: 15px;
  }
  .button-row button, .equals button, .fx-button {
    border-radius: 50%;
    padding: 6px 12px;
  }
  .button-row:first-child, .fx-board .button-row:first-child {
    margin-top: 30px;
  }
  .input-board {
    padding: 0;
  }
  /* for fx buttons*/
  .fx-board {
    width: 100%;
  }
  .fx-board .button-row {
    margin: 0;
    margin-left: 15px;
    padding: 0!important;
    height: 15%;
  }
  .fx-board .button-row:nth-child(2) {
    margin-top: 30px;
  }
  .fx-button {
    width: 72.8px;
    padding: 4px 8px;
    height: 69.29px;
  }
  .fx-display {
    border-radius: none;
  }
}