#eingabe {
    resize: none;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    color:aliceblue;
    height: 100px;
    font-family: sans-serif;
    font-size: 35px;
    width: 500px;
    border-top: rgba(0, 0, 0, 0);
    border-left: rgba(0, 0, 0, 0);
    border-right: rgba(0, 0, 0, 0);
    border-bottom: rgba(0, 0, 0, 1);
    text-align: right;
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
     -khtml-user-select: none; /* Konqueror HTML */
       -moz-user-select: none; /* Old versions of Firefox */
        -ms-user-select: none; /* Internet Explorer/Edge */
            user-select: none; 
}
.numberbutton {
    width: 100px;
    height: 100px;
    background-color: rgba(0, 0, 0, 0.5);
    color:aliceblue;
    font-family: sans-serif;
    font-size: 50px;
    border: rgba(0, 0, 0, 0);
    margin-left: -2;
    margin-right: -2;
}
.zerobutton {
    width: 200px;
    height: 100px;
    background-color: rgba(0, 0, 0, 0.5);
    color:aliceblue;
    font-family: sans-serif;
    font-size: 50px;
    border: rgba(0, 0, 0, 0);
    margin-left: -3;
}
.comabutton {
    width: 100px;
    height: 100px;
    background-color: rgba(0, 0, 0, 0.5);
    color:aliceblue;
    font-family: sans-serif;
    font-size: 50px;
    border: rgba(0, 0, 0, 0);
    margin-left: -4;
    margin-right: -2;
}
.numberbutton:hover {
    background-color: rgba(10, 10, 10, 0.5);
}
.comabutton:hover {
    background-color: rgba(10, 10, 10, 0.5);
}
.zerobutton:hover {
    background-color: rgba(10, 10, 10, 0.5); 
}
.numberbutton:active {
    background-color: rgba(110, 110, 110, 0.5);
}
.comabutton:active {
    background-color: rgba(110, 110, 110, 0.5);
}
.zerobutton:active {
    background-color: rgba(110, 110, 110, 0.5);
}
#eingabe:hover {
    background-color: rgba(10, 10, 10, 0.5); 
}
#calc {
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Safari */
     -khtml-user-select: none; /* Konqueror HTML */
       -moz-user-select: none; /* Old versions of Firefox */
        -ms-user-select: none; /* Internet Explorer/Edge */
            user-select: none; 
}
button  {
    outline: none;
}
#zero {
    width: 200px;
}
#equals {
    width: 200px;
}