calc.css

*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
    color: white;
    font-size: 16px;
}
body{
    display: grid;
    place-items: center;
    height: 100vh;
    width: 100vw;
    background-color: #121212;
}
main{
    display: flex;
    flex-direction: column;
    width: 350px;
    height: 500px;
    background: #1597ad;
    align-items: center;
    border-radius: 20px;
    border: 3px solid #00859c;
    padding-top:30px;
    gap: 20px;
    box-shadow: 8px 4px 15px #107385;
    position: relative;
}
#view-area{
    display: flex;
    flex-direction: column-reverse;
    width: 100%;
}

#current-operation{
    width: 100%;
    height: 100px;
    background:#30829b;
    position: relative;
    font-size: 3rem;
    display: flex;
    align-items: center;
    justify-content: end;
    overflow: auto;
}
#previus-operation-area{
    width: 100%;
    height: 50px;
    background:#30829b;
    display: flex;
    font-size: 1.5rem;
    justify-content: end;
    gap: 5px;
}

#result, #op-number{
    width: max-content;
    height: 100%;
}

#previus-operation #op-type{
    height: 100%;
    width: max-content;
    display: flex;
    align-items: center;
    justify-content: center;
}

#buttons-area{
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.row{
    display: flex;
    flex-direction: row-reverse;
    gap: 5px;
}

.buttons{
    display: grid;
    place-items: center;
    background: #1c8d71;
    width: 80px;
    height: 40px;
    border: 1px solid #003d2e;
    box-shadow: 1px 1px 0px #043b2e;
    user-select:none
}
.buttons:hover{
    background:#095f4a;
}
.buttons:active{
    background: linear-gradient(45deg,#066951 30%,#1c8d71 65%,#066951 70%);
    border: none;
    box-shadow: none;    
}

#equal{
    background: #1c568d;
    border: 1px solid #00183d;
    box-shadow: 1px 1px 0px #040e3b;
}

#equal:hover{
    background: #04093b;;
}

#equal:active{
    background: linear-gradient(45deg,#00183d 30%,#1c568d 65%,#00183d 70%);
    border: none;
    box-shadow: none;    
}
#historic{ 
    position: absolute;
    font-size: 16px;
    bottom: 94.5%;
    left:88%;
    background:#1597ad;
    border: none;
    width: 25px;
    height: 25px;
    display: grid;
    place-items: center;
    border-radius: 5px;
}
#historic:hover{
    background:#18abc5;  
}
#historic:active{
    background:#117a8d;    
}
i{
    color: #2415ad;
}