*{
    border-radius: 500px;
    margin:0;
    padding: 0;
    box-sizing: border-box;
}

body{
    font-family: "Helvetica Neue", sans-serif;
     min-height: 100vh;
     background-color:rgb(197, 18, 18);
     display: flex;
     justify-content: center;
     align-items: center;

}


#calculator{
    width: 300px;
    height: 540px;
    box-shadow: 4px 4px 30px rgba(0, 0, 0, 0.5);
    border-radius: 20px;
    background: black;
    overflow: hidden;
}
#b1{
    border: 1px outset ;
    background: #545964;
    color: #ff9500;
    padding: 1px;
    font-size: 12px;
    font-weight: 600;
    width: 100px;
    height: 60px;
    cursor: pointer;
    border-radius: 1px;
    position: absolute;
  
    right: 50px;
    bottom: 20px;

}
.color button{
    background: none;
    outline: none;
    color: azure;
    border: 3px solid white;
    cursor: pointer;
    font-size: 24px;

}
.box{
    width: 100%;
    height: 180px;
    border: none;
    border-radius: 12px;
    font-size: 2rem;
    padding: 1rem;
    color: #fff;
    background: rgb(0, 0, 0);
    pointer-events: none;
    text-align: right;
    align-items: flex-end;

}

button{
    flex: 0 0 22%;
    border: 1px #636363;
    align-content: center;
    text-align: center;
    text-decoration: none;
    padding: 1px;
    width: 60px;
    height: 60px;
    font-size: 22px;
    font-weight: 600;
    border-radius: 50%;
    display: inline-block;
    cursor: pointer;
    margin: 3.8px 5px;
}

#last_operation_history {
    height: 2px;
    font-size: 1.8vh;
    text-align:right;
    padding-right: 1.5vh;
    color: rgb(177, 176, 176);
    background-color: black;
}



button:hover{
background-color:#8e0101;
color: azure;
transition: 0.8 ease-in-out;
}

#uniquebutton{
    
    display: inline-block;
    width: 200%;
    text-indent: 0.6cm;
    border-radius: 40px;
    margin: 5px 5px;
    text-align: left;
    align-items: stretch;
}

.btn-yellow{

    background:#ff9500;
    color: white;
}

.btn-grey{

    background: #505050;
    color:white;
}



.btn-white {
    background: #d4d4d2;
    
}

#eq{
    border-color: #08288a;
}