body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-align: center;
    align-items: center;
    justify-content: center;
    background-image: url(clcbg.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
}
h1{
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
}
.blink{
    animation: blink 2s linear infinite;
    color: blue;
}
@keyframes blink{
    50%{
        opacity: 0;
    }
}
#display{
    text-align: right;
}

#calculator{
    display: inline-block;
    border: 2px solid grey;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    background-color: #bdbbbb;
    backface-visibility:hidden ;
    border-top-style: outset;
    border-top-width: 10px;
}

input {
    width: 100%;
    margin-bottom: 10px;
    padding: 10px;
    box-sizing: border-box;
}

.material-icons{
   font-size: medium;
}

button {
    width: 65px;
    padding: 10px;
    margin: 5px;
    font-size: 18px;
    cursor: pointer;
    border-radius: 10px;
    border-bottom-style: outset;
    border-bottom-width: 5px;
    border-left-style: outset;
    border-left-width: 5px;
    border-color: grey;
    border-bottom-color: grey;
}

button:hover 
    {
        box-shadow: inset 5px 5px 8px grey,
                    inset -5px -5px 8px grey;
    }


#Clear{
    background-color: orange;
    border-color: orange;

}