*{
    margin: 0;
    padding: 0;
    font-family: 'poppins',sans-serif;
    box-sizing: border-box;
}

.heading{
    border: 5px solid rgba(207, 184, 184, 0.815);
    border-radius: 10px;
    padding: 1px;
    color: #33ffd8;
    
}
.heading h1{
    margin-left: 10px;
}

.container{
    width: 100%;
    height: 100vh;
    background: #e3f9ff;
    display: flex;
    align-items: center;
    justify-content: center;
    display: flex;
    align-items: flex-start; /*aligns top */
    justify-content: center;
    padding-top: 20px; /* optional spacing */

}
.calculator{
    background: #3a4452;
    padding: 20px;
    border-radius: 10px;
}
.calculator form input{
    border: 0;
    outline: 0;
    width: 60px;
    height: 60px;
    border-radius: 10px;
    box-shadow: -8px -8px 15px rgba(255,255,255,0.1), 5px 5px 15px rgba(0,0,0,0.2);
    background: transparent;
    font-size: 20px;
    color:#fff;
    cursor: pointer;
    margin: 10px;

}

form .display{
    display: flex;
    justify-content: flex-end;
    margin: 20px 0;

}

form .display input{
    text-align: right;
    flex: 1;
    font-size: 45px;
    box-shadow: none;

}


form input.equal{
    width: 145px;
}

form input.operator{
    color: #33ffd8;
}

.his-container{
    background: #3a4452;
    margin-left: 15px;
    border: 5px solid grey;
    border-radius: 10px;
    padding: 20px;
    color:#fff;    
}
.his-container h2{
    color: #33ffd8;
    margin-bottom: 5px;
}

#history {
  list-style: none;
  line-height: 1.5;
}