body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    justify-content: center;
    align-items: center;
    background-color: #757575;
}

#calcDesign{
    display: flex;
    justify-content: center;
    align-items: center;
    height: 500px;
    width: 350px;
    background-color: #373E40;
    border-radius: 25px;
    padding: 20px;
    border: solid 1px #FBFBFF;
}

#calcContainer{
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 90%;
    width: 90%;
    gap: 30px;
}

#calcDisplay {
    display: flex;
    background-color: #FFFFFF;
    height: 20%;
    border-radius: 25px;
    padding: 20px;
    font-size: xx-large;
    justify-content: end;
    align-items: center;
}

#buttonContainer {
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 75%;

}

.row {
   display: flex;
   flex: 1 1 auto;
   width: 100%;
   align-items: center;
   justify-content: space-around;
}

.row > button {
    flex-shrink: 0;
    width: 22.5%;
    height: 90%;
}

button {
    float:left;
    line-height:1em;
          
    text-align:center;
    color: white;
    font-family:Verdana;
    font-size: 3.0vh;
    font-weight:bold;
    text-decoration:none; 
    background-color: #0B4F6C;

    border-color: white;
    border-radius: 10px;
    border-width: 2px;
}

#row1 > button, 
.last-col{
    background-color: #982649 ;
    color: white;
}