style.css

/* Developed by Siddharth Pandey */

@import url('https://fonts.googleapis.com/css?family=Nova+Round&display=swap');
* {
    margin: 0;
    padding: 1px;
    box-sizing: border-box;
}

body {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(-45deg, #FA8BFF, #2BD2FF, #FFE53B, #FF2525, #FBDA61);
    background-size: 800% 800%;
    animation: gradient 40s ease infinite;
}

@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

#calculator {
    min-width: 273px;
    min-height: 48px;
    background: #EBECF1;
    box-shadow: 0px 10px 50px rgba(0, 0, 0, 0.15);
    border-radius: 24px;
    font-family: Nova Round;
    font-style: normal;
    font-weight: normal;
    font-size: 24px;
    line-height: 29px;
    transition: background-color .5s ease-in-out, box-shadow .5s ease-in-out;
}

#result {
    width: 233px;
    height: 91px;
    background-color: #EBECF1;
    box-shadow: inset 1.5px 1.5px 3px #CBCBCB, inset -1.5px -1.5px 3px #FFFFFF;
    border-radius: 24px 24px 10px 10px;
    margin: 20px 20px 20px 20px;
    transition: background-color .5s ease-in-out, box-shadow .5s ease-in-out;
}

#history {
    font-size: 30px;
    line-height: 36px;
    margin-bottom: 5px;
    overflow: auto;
    user-select: all;
}

#history-value {
    transition: color .5s ease-in-out;
}

#output {
    font-size: 22px;
    line-height: 24px;
    color: rgb(153, 153, 153);
    overflow: auto;
    transition: color .5s ease-in-out;
}

#output-text {
    text-align: end;
    padding: 17px;
    font-size: 30px;
}

#microphone {
    height: 30px;
    width: 30px;
    float: right;
    background-image: url(mic.png);
    background-size: 100% 100%;
    border-radius: 50%;
    margin: 20px;
    margin-top: 60px;
}

.record {
    animation: microphone-animation 1.5s infinite;
}

@Keyframes microphone-animation {
    0% {
        transform: scale(0.9);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 10px rgba(0, 148, 255, 0.4);
    }
    100% {
        transform: scale(0.9);
        box-shadow: 0 0 0 0 rgba(0, 148, 255, 0);
    }
}

.tooltip {
    width: 200px;
    font-size: 9px;
    position: absolute;
    background-color: #dddddd;
    color: #636363;
    padding: 10px;
    top: 216px;
    transform: translateX(255px);
    border-radius: 5px;
    visibility: hidden;
}

.tooltip::before {
    content: '';
    position: absolute;
    border-width: 5px;
    border-style: solid;
    border-color: transparent #dddddd transparent transparent;
    left: 0;
    margin-left: -10px;
}

#output-microphone:hover .tooltip {
    visibility: visible;
}

#keyboard {
    width: 233px;
    height: 296px;
    margin: 20px 20px 20px 20px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(5, 1fr);
    grid-column-gap: 19px;
    grid-row-gap: 19px;
}

.style {
    box-shadow: 4.5px 4.5px 9px #CBCBCB, -4.5px -4.5px 9px #FFFFFF;
    border-radius: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background-color .5s ease-in-out, box-shadow .5s ease-in-out, color .5s ease-in-out;
}

.styleOnClick {
    box-shadow: inset 2px 2px 4px #CBCBCB, inset -2px -2px 4px #FFFFFF;
    font-size: 20px;
    opacity: 0.8;
}

.circle {
    width: 44px;
    height: 44px;
}

.numColor {
    color: #373737;
    font-size: 20px;
}

.trashCan {
    width: 15px;
    height: 15px;
}

.ariOpeColor {
    color: rgb(1, 7, 12);
}

.zero {
    width: 107px;
    height: 44px;
    font-size: 20px;
    grid-area: 5 / 1 / 6 / 3;
}

.operator,
.number,
.empty {
    border-width: 0;
    font-weight: bold;
}

.number,
.empty {
    background-color: #eaedef;
}

.number,
.operator {
    cursor: pointer;
}

.operator:active,
.number:active {
    font-size: 13px;
}

.operator:focus,
.number:focus,
.empty:focus {
    outline: 0;
}

button:nth-child(4) {
    font-size: 20px;
    background-color: #20b2aa;
}

button:nth-child(8) {
    font-size: 20px;
    background-color: #ffa500;
}

button:nth-child(12) {
    font-size: 20px;
    background-color: #f08080;
}

button:nth-child(16) {
    font-size: 20px;
    background-color: #7d93e0;
}

button:nth-child(18) {
    font-size: 20px;
    background-color: #77af83;
}

button:nth-child(3) {
    font-size: 20px;
    background-color: #9477af;
}

button:nth-child(2) {
    font-size: 20px;
    background-color: #aeb829;
}

.equal {
    width: 44px;
    height: 100px;
    font-size: 200px;
    color: rgb(1, 22, 11);
    grid-area: 4 / 4 / span 2 / span 1;
}


/* Developed by Siddharth Pandey */