#display{
    margin-left: 20px;
    padding: 30px;
    width: 257px;
    text-align: left;
    border:  2px solid;
    border-radius: 10px;


}
.calc-title {
    padding: 20px;
}

#calculatorheader {
    margin-top: 0;
    top: 100px;
    left: 100px;
    background-color: rgba(255, 255, 255, 0.5);
    width: max-content;
    height: max-content;
    border: solid 2px black;
    border-radius: 5%;
    box-shadow: 5px 5px 5px rgb(127, 185, 255);
    position: absolute;
    overflow: hidden;
    display: none;

}
#calc-close{
    height: 25px; 
    margin-left: 120px; 
    top: 20px;
}
#keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    padding: 25px;
    font-size: larger;
}
button {
    width: 70px;
    height: 70px;
    border: 1px solid black;
    border-radius: 15%;
    padding: 20px;
    background: 
    /* Top glass gloss overlay */
    linear-gradient(to bottom, rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0) 45%),
    /* Lighter blue-to-cyan spectrum gradient */
    linear-gradient(135deg, #a6f6ff 0%, #00d2ff 45%, #0076ff 100%);
    box-shadow: inset 0 2px 5px rgba(255, 255, 255, 0.5);
    cursor: pointer;
    text-align: center;
    align-content: center;
}