style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'poppins', sans-serif;
}

body {
    height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background-color: #100f0f;
}

h1 {
    color: green;
    font-size: 70px;
}

.container {
    min-width: 500px;
    padding: 30px 20px;
    background: #000000;
    border-radius: 10px;
    margin-top: 50px;
}

.container .input_container {
    border: 2px solid green;
    background: #ffffffbb;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.container .input_container #input {
    width: 100%;
    height: 30px;
    border-radius: 10px;
    background: transparent;
    border: none;
    outline: none;
    padding: 20px 15px;
    font-size: 20px;
    font-weight: bold;
}

.container .input_container .fa-copy {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    cursor: pointer;
    opacity: 0.6;
}

.container .input_container .fa-copy:hover {
    opacity: 1;
}

.container .row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #1f1d1d;;
    padding: 5px 0;
    margin: 10px;
}
.container .row h2 {
    color: #00ffffcc;
}

.container .row input[type="checkbox"] {
    cursor: pointer;
    height: 15px;
    width: 15px;
}

.container #btn {
    width: 100%;
    padding: 10px 0;
    border-radius: 10px;
    border: none;
    font-size: 20px;
    font-weight: bold;
    color: #fff;
    background: green;
    margin-top: 15px;
    cursor: pointer;
}

.container #btn:hover {
    color: #000;
}

.container #btn:active {
    transform: scale(0.95);
}

.hide {
    display: none;
}