style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    font-family: 'Roboto', sans-serif;
    font-size: 62.5%;
}

main {
    background: linear-gradient(45deg, orange, cyan);
    min-height: 100vh;
    display: flex;
    justify-content: space-between;
}

.begin {
    width: 300px;
    height: fit-content;
    display: flex;
    flex-direction: column;
    padding-bottom: 20px;
    background-color: #FFF;
    margin: auto;
    opacity: 0.9;
    border-radius: 20px;
    /* display: none; */
}

.begin__logo {
    text-align: center;
}

.begin__logo img {
    width: 50%;
    rotate: 45reg;
}

.board {
    margin-left: 150px;
    margin-top: 45px;
    display: none;
}

.control {
    width: 300px;
    height: fit-content;
    display: flex;
    flex-direction: column;
    padding-bottom: 20px;
    background-color: #FFF;
    margin-right: 150px;
    margin-top: auto;
    margin-bottom: auto;
    opacity: 0.9;
    border-radius: 20px;
    display: none;
}

.begin__heading, .control__heading {
    font-size: 1.8rem;
    text-transform: uppercase;
    display: flex;
    justify-content: center;
    padding: 10px 0;
    font-weight: 600;
    letter-spacing: 2px;
}

.control__imgPlayer {
    width: 100px;
    height: 100px;
    margin: 5px auto 5px;
    margin-top: 5px;
    background-image: url('./Images/Opng.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-color: #CCC;
}

.begin__time--label {
    font-size: 1.8rem;
    text-transform: capitalize;
    margin-left: 10px;
}

.begin__chbtime {
    margin-right: 4px;
}

.control__time {
    width: 90%;
    font-size: 1.8rem;
    /* background-color:#3F6; */
    margin: 15px 15px 0;
}

time {
    font-size: 1.6rem;
    margin-left: auto;
    margin-right: 15px;
}

.begin__btn, .control__button {
    border: none;
    padding: 10px 12px;
    cursor: pointer;
    margin: 10px 15px 0;
    border-radius: 20px;
    font-weight: 500;
}

.begin__btn:hover, .control__button:hover {
    background: linear-gradient(45deg, cyan, orange);
    font-weight: bold;
}

.square {
    width: 35px;
    height: 35px;
    opacity: 0.8;
    font-size: 10px;
    /* border-right:#000 1px solid;
	border-top:#000 1px solid; */
    background-color: #FFF;
    border-radius: 5px;
    background-repeat: round;
    overflow: hidden;
    cursor: pointer;
    transition: all linear 0.2s;
}

.square:hover {
    background-color: orange;
}

.begin__CPlayer {
    margin: 15px 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
}

.begin__CPlayer--label {
    width: 100%;
    margin: 10px;
    font-size: 1.8rem;
}

label {
    border: 1px solid transparent;
    padding: 5px;
    border-radius: 20px;
    cursor: pointer;
}

label[for="X"]:hover, label[for="O"]:hover, #X:checked~label[for="X"], #O:checked~label[for="O"] {
    border-top-color: cyan;
    border-right-color: cyan;
    border-bottom-color: orange;
    border-left-color: orange;
}

.begin__time--label {
    position: relative;
    display: flex;
    align-items: center;
}

.begin__chbtime {
    display: none;
}

.switch-label {
    display: inline-block;
    width: 48px;
    height: 24px;
    text-indent: -150%;
    clip: rect(0 0 0 0);
    color: transparent;
    user-select: none;
}

.switch-label::before, .switch-label::after {
    content: "";
    display: block;
    position: absolute;
    cursor: pointer;
}

.switch-label::before {
    top: 0;
    width: 45px;
    height: 24px;
    /* width: 100%;
    height: 100%; */
    background-color: #dedede;
    border-radius: 9999em;
    -webkit-transition: background-color 0.25s ease;
    transition: background-color 0.25s ease;
}

.switch-label::after {
    top: 0;
    left: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: #fff;
    box-shadow: 0 0 2px rgba(0, 0, 0, 0.45);
    -webkit-transition: left 0.25s ease;
    transition: left 0.25s ease;
}

.begin__chbtime:checked+.switch-label::before {
    background-color: #89c12d;
}

.begin__chbtime:checked+.switch-label::after {
    left: 30px;
}

span {
    margin-left: 20px;
}