index.css

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  max-width: 800px;
  margin: auto;
  padding: 1em 1em;
  font-family: sans-serif;
}
pre {
  padding: 1em;
  max-width: 100%;
  overflow-x: auto;
}
img {
  height: auto;
  width: 100%;
}
input[type="email"],
textarea {
  width: 100%;
  padding: 1em;
}
nav {
  display: flex;
  justify-content: space-between;
  margin-bottom: 1em;
}
nav a {
  padding: 1em;
}
nav svg {
  width: 8em;
}

.float {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.card {
  background-color: #fff;
  margin: 10px;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.card .details {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
}

.card .details div {
  margin: 0.5rem;
}

.card .details div div {
  text-align: center;
}

.card button {
  background-color: #007bff;
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 3px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.card button.red {
  background-color: #ff4136;
}

.error {
  color: red;
}

.quickActions {
  position: fixed;
  bottom: 0;
  right: 0;
  display: flex;
  flex-direction: column-reverse;
}

.quickActions button {
  margin: 0.5rem;
  height: 3rem;
  width: 3rem;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #333;
  }
  body,
  a {
    color: white;
  }
  .card {
    background-color: #555;
  } 
}

label {
  display: block;
  margin-bottom: 0.5rem;
}

input {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 1rem;
}