*{
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  transition: all 0.3s ease-in-out;
  font-family: "Roboto", sans-serif;
  transition: all 0.3s ease-in-out;
}
button{
  cursor: pointer;
  border-width: 0px;
}
:root{
  --base-color : #3b4664;
  --answer-box : #181f32;
  --button-box : #252c46;
  --button-color:#eae3db;
  --extra-btn  : #31467e;
}
.light-mode{
  --base-color   :   #d7d7d7;
  --answer-box   :   #4d4d4d;
  --button-box   :   #a4a4a4;
  --button-color :   #1e1e1e;
  --extra-btn    :   #1b3b92;
}
body{
  background-color: var(--base-color);
  display: flex;
  width: 100vw;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
}
.calBody{
  width: 500px;
  background-color: transparent;
  height: 700px;
  margin-top: 50px;
}
.top{
  display: flex;
  width: 100%;
  justify-content: space-between;
}
.top .themeToggle{
  width: 50px;
  height: 50px;
  background-color: var(--answer-box);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  cursor: pointer;
}
.answerBox{
  background-color: var(--answer-box);
  width: 100%;
  height: 100px;
  border-radius: 10px;
  margin-top: 20px;
  padding: 10px;
}
.buttonBox{
  width: 100%;
  height: 400px;
  background-color: var(--button-box);
  border-radius: 10px;
  margin-top: 20px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  grid-template-rows: 1fr 1fr 1fr 1fr 1fr;
  gap: 20px;
  padding: 20px;
}
button{
  font-size: 1.7rem;
  border-radius: 10px;
  font-weight: bolder;
  color: var(--button-box);
}
.number{
  background-color: var(--button-color);
}
.operation{
  background-color: var(--button-color);
}
.del{
  background-color: var(--extra-btn);
  color: var(--button-color);
  color: rgb(215, 215, 215);
}
.reset{
  background-color: var(--extra-btn);
  color: var(--button-color);
  grid-area: 5 / 1 / 5 / 3 ;
  color: rgb(215, 215, 215);
}
.equal{
  background-color: #d13f30;
  grid-area: 5 / 3 / 5 / 5;
}
.number:hover{
  background-color: white;
}
.operation:hover{
  background-color: white;
}
.equal:hover{
  background-color: #e4321f;
}
.del:hover{
  background-color: #092aa1;
}
.reset:hover{
  background-color: #092aa1;
}
.grey{
  width: 100%;
  text-align: right;
  color: rgb(211, 211, 211);
  font-size: 1.5rem;
  font-weight: bold;
  display: flex;
  justify-content: right;
}
.black{
  width: 100%;
  text-align: right;
  font-size: 1.7rem;
  font-weight: bold;
  color: white;
  margin-top: 10px;
}
@media screen and (max-width:570px) {
  .calBody{
    width: 95vw;
    height: 80vh;
  }
  .buttonBox{
    height: 60%;
  }
}




/*! STYLES FOR HISTORY SECTION */

.history{
  width: auto;
  height: 75px;
  overflow-y: scroll;
  padding: 20px 30px;
  text-align: center;
  position: fixed;
  background-color: var(--answer-box);
  top: 50%;
  left: 0%;
  transform: translate(0%, -50%);
  border-radius: 10px;
  scrollbar-width: none;         /* Firefox */
}

.history:hover{
  animation: none;
}
.history .historyText{
  display: flex;
  align-items: center;
  color: white;
  width: max-content;
  font-weight: normal;
  column-gap: 10px;
  cursor: pointer;
  margin-bottom: 10px;
}
.historyText h1{
  display: none;
  font-weight: normal;
  font-size: 1.5rem;
}
.historyText:hover h1{
  display: inline;
}
.histories{
  display: none;
}
.historyn{
  padding: 10px;
  text-align: left;
  color: rgb(196, 196, 196);
  border: 2px solid grey;
  border-left-color: transparent;
  border-right-color: transparent;
  border-top-color: transparent;
  display: flex;
  align-items: center;
  column-gap: 50px;
  justify-content: space-between;
}
.historyShow{
  display: flex;
}
.delHistory{
  background-color: rgb(204, 53, 53);
  padding: 3px;
  border-radius: 5px;
  cursor: pointer;
}
.delHistory:hover{
  background-color: rgb(242, 23, 23);
}
.history1{
  border-top-color: grey;
}
.historyValues{
  width: max-content;
}

@media screen and (max-width: 700px) {
  .history{
    bottom: 20px;
    top: 90%;
    left: 50%;
    transform: translate(-50%, 0%);
  }
}
.op{
  margin-left: 5px;
}
.history h3{
  color: white;
  font-weight: normal;
}