:root,
input,
button {
    font-family: monospace;
}

body {
    margin: 0;
    padding-bottom: 3rem;
}

#form {
    background: rgba(0, 0, 0, 0.15);
    padding: 0.25rem;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    box-sizing: border-box;
    backdrop-filter: blur(10px);
}

.inner-form {
    display: flex;
    flex-wrap: wrap;
    min-height: 3rem;
}

#input {
    border: none;
    padding: 0 1rem;
    flex-grow: 1;
    border-radius: 0.3rem;
    margin: 0.25rem;
}

#input:focus {
    outline: none;
}

.inner-form>button {
    background: #333;
    border: none;
    padding: 0 1rem;
    margin: 0.25rem;
    border-radius: 3px;
    outline: none;
}

button, button a {
    color: #fff;
    text-decoration: none;
}

#messages {
    list-style-type: none;
    margin: 0;
    padding: 0;
}

#messages>li {
    padding: 0.5rem 1rem;
    white-space: pre-wrap;
}

#messages>li:nth-child(odd) {
    background: #efefef;
}