style.css

body {
    overflow: hidden;
    justify-content: center;
    align-items: center;
}


.container {
    max-width: 400px;
    width: 100%;
    margin: 10vh auto 0 auto;
    box-shadow: 0 0 43px 17px rgba(153, 153, 153, 0.5);
    font-family:system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif ;
    
}

#display {              
    text-align: right;
    height: 70px;
    line-height: 70px;
    padding: 16px 8px;
    overflow-x: scroll;
    font-size: 25px;
    border: none;
}

input {
    color: transparent;
    text-shadow: 0 0 0 black;
  }

#display:focus {
    border-color: transparent !important;
    -webkit-box-shadow: none;
    box-shadow: none;
    outline: none;
}


#display::-webkit-scrollbar {
    display: none;
}

#display::-webkit-scrollbar-track {
    background: #f1f1f1;
}

#display::-webkit-scrollbar-thumb {
    background: #888;
}

#display::-webkit-scrollbar-thumb:hover {
    background: #555;
}   

#display:hover {
    overflow-x: auto;
    cursor: pointer;
}

::selection { background: transparent; } ::-moz-selection { background: transparent; }

.buttons {
    display: grid;
    border-bottom: 1px solid #ccc;
    border-left: 1px solid #ccc;
    grid-template-columns: repeat(4, 1fr);
}

.buttons > div {
    border-right: 1px solid #ccc;
    border-top: 1px solid #ccc;
    padding: 16px 0;
    text-align: center;
    font-size: 25px;
    cursor: pointer;
}

.button {
    background-color: #f1f1f1;
}

#equal {
    background-color: #6117ec;
    color: white;
}

.button:hover {
    background-color: #dddddd;
    transition: 0.3s ease-in-out;
}

#equal:hover {
    background-color: #4f0acf;
    transition: 0.3s ease-in-out;
}

.textWrapper {
    position: relative;
    font-size: 80px;
    margin-left: 170px;
    text-transform: uppercase;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

span {
    position: relative;
    display: inline-block;
    color: #4f0acf;
    animation: waveAnim 1s infinite;
    animation-delay: calc(.1s * var(--i));
}

@keyframes waveAnim {
    0% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
    100% {
        transform: translateY(0);
    }
}