.calculator {
    border: 1px solid .ccc;
    border-radius: 5px;
    position: absolute;
    padding-top: 6px;
    padding-left: 6px;
    padding-right: 3px;
    background-color: rgb(212, 212, 212);
    background-image: linear-gradient(to bottom, transparent, transparent 50%, rgba(0, 0, 0, .11)), linear-gradient(to top, transparent, transparent 50%, rgba(0, 0, 0, .11));
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .55), inset 0 1px 0 0 rgba(255, 255, 255, .45), inset 0 -1px 0 0 rgba(255, 255, 255, .25), inset 0 1px 0 0 rgba(255, 255, 255, .55);
}
.calculator_screen {
    background-color: rgb(0, 0, 0);
    color: rgb(255, 255, 255);
    border-radius: 5px;
    height: 60px;
    margin-bottom: 6px;
    width: 223px;
    font-size: 33px;
    text-align: right;
}
button {
    font-family: serif;
    margin-bottom: 8px;
    margin-right: 4px;
    font-size: 20px;
    border-radius: 10px;
    border: solid gray 1px;
    height: 50px;
    width: 50px;
    background-color: rgb(240, 240, 240);
    background-image: linear-gradient(to bottom, transparent, transparent 50%, rgba(0, 0, 0, .11)), linear-gradient(to top, transparent, transparent 50%, rgba(0, 0, 0, .11));
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .55), inset 0 1px 0 0 rgba(255, 255, 255, .45), inset 0 -1px 0 0 rgba(255, 255, 255, .25), inset 0 1px 0 0 rgba(255, 255, 255, .55);
}
button:hover {
    background-image: linear-gradient(to bottom, transparent, transparent 50%, rgba(0, 0, 0, .11)), linear-gradient(to top, transparent, transparent 50%, rgba(0, 0, 0, .11));
    background-color: rgb(230, 255, 230);
}
button:active {
    background-color: rgb(180, 255, 180);
    background-image: linear-gradient(to bottom, transparent, transparent 50%, rgba(0, 0, 0, .11)), linear-gradient(to top, transparent, transparent 50%, rgba(0, 0, 0, .11));
    color: black;
}
#enter {
    background-color: rgb(255, 190, 100);
    color: black;
}
#enter:hover {
    background-color: rgb(255, 150, 30);
}
#enter:active {
    background-color: rgb(255, 127.5, 0);
}
.AC {
    background-color: rgb(255, 71, 71);
    height: 25px;
    font-family: sans-serif;
    font-size: 14px;
}
.AC:hover {
    background-color: rgb(235, 0, 0);
}
.AC:active {
    background-color: rgb(255, 0, 0);
}
.op {
    color: rgb(54, 151, 255);
}
.opop {
    color: rgb(54, 151, 255);
}