body {
    font-family: "Open Sans", sans-serif;
    background-color: rgb(99, 4, 48);
    margin-top: 120px;
}
body::-webkit-scrollbar {
    display: none;
}
 
#calculator {
    max-width: 320px;
    width: 340px;
    height: 600px;
    background-color: #eaedef;
    margin: auto;
    padding: 10px;
    top: 37px;
    position: relative;
    border-radius: 5px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
#result { 
    height: 120px;
    border-width: 2px;
    border-color: black;
    border-radius: 5px;
    background-color: #c2c7cb;
    font-size: fit-content;
    overflow: scroll;
}
  
#history {
    text-align: right;
    height: 20px;
    margin: 0 20px;
    padding-top: 20px;
    font-size: 15px;
    color: #919191;
}
  #result::-webkit-scrollbar {
    display: none;
}
#history::-webkit-scrollbar {
    display: none;
}
#output {
    text-align: right;
    height: 60px;
    margin: 10px 20px;
    font-size: 30px;
}
#keyboard {
    height: 450px;
    background-color: #eaedef;
}
.operator,.number,.empty {
    width: 50px;
    height: 50px;
    margin: 15px;
    float: left;
    border-radius: 50%;
    border-width: 0;
    font-weight: bold;
    font-size: 15px;
}
.number,.empty {
    background-color: #eaedef;
}
.number,.operator {
    cursor: pointer;
}
.operator:active,.number:active {
    font-size: 13px;
}
.operator:focus,.number:focus,.empty:focus {
    outline: 0;
}
button:nth-child(4) {
    font-size: 20px;
    background-color: #20b2aa;
}
button:nth-child(8) {
    font-size: 20px;
    background-color: #ffa500;
}
button:nth-child(12) {
    font-size: 20px;
    background-color: #f08080;
}
button:nth-child(16) {
    font-size: 20px;
    background-color: #7d93e0;
}
button:nth-child(20) {
    font-size: 20px;
    background-color: #9477af;
}
.head{
    color: white;
    text-align: center;
    font-size: 30px;
    font-weight: bold;
    padding-top: 20px;
    padding-bottom: 20px;
    background-color: #919191;
    border-radius: 5px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    margin-top:-80px;
}