style.css

@import url('https://fonts.googleapis.com/css2?family=Chau+Philomene+One&display=swap');

body {
    height: 100vh;
    background-color: black;
    background-image: url("https://images.unsplash.com/photo-1526374965328-7f61d4dc18c5?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=3150&q=80/900x900");
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Chau Philomene One', sans-serif;
}

h1 {
    color: white;
    font-weight: 200;
    font-size: 4vh;
}

.main-container {
    background-color: #071e14d3;
    width: 30%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

.result-line {
    display: flex;
    padding: 20px 0;
	font-size: 1.5rem;
    letter-spacing: 2px;
    font-weight: 100;

}

.result-line #result {
    padding: 10px 15px;
    word-wrap: break-word;
    max-width: calc(100% - 60px);
    font-weight: 100;
}

#clipboard {
    width: 60px;
    font-size: 1.5rem;
}

.span {
    width: 100%;
    height: 45px;
    background-color: #449e72;
}

.settings {
    display: flex;
    flex-direction: column;
}

.input {
    display: flex;
    line-height: 2em;
    font-size: 2.5vh;
    align-items: center;
    justify-content: space-between;
}

.input input[type=checkbox]{
    transform: scale(1.5);
}


.input input[type=number]{
    font-size: 1.5vh;
    font-family: 'Chau Philomene One', sans-serif;
}

.input label[for=length]::after {
    content: "(min. 8 - max. 24 characters)";
    font-size: 1vh;
    padding: 0 10px;
}


form {
    width: 90%;
    color: white;
}

#generate {
    width: 100%;
    height: 2em;
    font-family: 'Chau Philomene One', sans-serif;
    color: white;
    font-size: 3vh;
    background-color: #449e72;
    border: none;
    margin: 20px 0;
}

#generate:hover {
    background-color: green;
}

#generate:active {
    background-color: green;
    transform: translateY(3px);
}

@media only screen and (min-width: 700px) {
    .main-container {
        width: 50%;
    }
}

@media only screen and (max-width: 500px) {
    .main-container {
        width: 90%;
    }
}

@media only screen and (max-width: 375px) {
    .main-container {
        width: 100%;
        padding: 40px 10px;
    }

    form {
        width: 95%;
    }
}