style.css

* {
    margin: 0;
}

body {
    background: rgb(235, 237, 255);
    font-family: Arial, Helvetica, sans-serif;
}

nav {
    background: rgb(38, 42, 79);
    padding: 35px;
    color: white;
    display: flex;
    justify-content: space-between;
}

.dropbtn {
    font-size: 24px;
    background: rgb(104, 104, 120);
    padding: 6px;
    text-decoration: none;
    color: white;
}

p {
    color: rgb(29, 29, 29);
    margin: 8px;
    text-align: center;
    font-size: 20px;
}

input {
    background: white;
    border: solid black 1px;
    margin: 8px;
    font-size: 24px;
    color: black;
    transition: transform .5s;
    display: block;
    margin : 0 auto;
}

input:focus {
    border: solid black;
}

button {
    padding: 8px;
    background-color: rgb(236, 237, 255);
    color: black(41, 41, 41);
    border-radius: 10px;
    font-size: 25px;
    transition: transform .2s;
    display: block;
    margin : 0 auto;
    border: solid black 2px;
}

button:active {
    background-color: white;
    color: blue;
    transition: color transform .2s;
    transform: scale(1.2)
}

.container {
    padding: 16px;
}

.container-flex {
    padding: 16px;
    display: flex;
}

.result {
    font-size: 30px;
}

.checkbox {
    transform: scale(1.25);
}

.checkbox:active {
    transform: scale(2.5);
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: rgb(104, 104, 120);
    box-shadow: 0px 4px 8px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    color: rgb(255, 255, 255);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {
    background-color: #f1f1f1;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.IndexButton {
    border: solid black;
    padding: 10px;
    border-radius: 10px;
    color: black;
    background-color: rgb(236, 237, 255);
    text-decoration: none;
    font-weight: bold;
}

.title {
    font-size: 28px;
    color: white;
    text-decoration: none;
}