body {
    margin: 0;
}

*:disabled {
    filter: grayscale(100%) brightness(110%);
}

button {
    position: relative;
    border-radius: 0;
    border: 0.4vmin solid lightblue;
    padding: 1em;
    background-color: white;
    display: block;
}

button:hover:not(:disabled) {
    background-color: lightblue;
    color: white;
    transition: 0.3s;
}

button:disabled::before {
    display: none;
    z-index: -1;
}

button::before {
    content: "";
    position: absolute;
    background-color: transparent;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    transition: 0.2s;
}

button:hover::before {
    top: 0.5em;
    left: 0.5em;
    background-color: black;
    transition: 0.2s;
}

button:active::before {
    top: 0.3em;
    left: 0.3em;
    transition: 0.2s;
}

form {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 3vmin;
}

input {
    border-radius: 0;
    border: 0.4vmin solid lightblue;
    padding: 0.3em;
    background-color: white;
    display: block;
}

input:focus {
    outline: none;
}

input::before {
    content: attr(placeholder);
}

.input {
    position: relative;
    width: min-content;
    height: min-content;
}

.input > input + span.indicator {
    content: "";
    position: absolute;
    background-color: transparent;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    transition: 0.2s;
}

.input > input:focus + span.indicator {
    top: 0.2em;
    left: 0.2em;
    background-color: black;
    transition: 0.2s;
}