styles.css

* {
  margin: 0; padding: 0;
  background-color: var(--black);
  text-align: center;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  color: var(--white);
}

header {
  height: 40px;
  min-width: 260px;
  margin: 10px 0;
  border-bottom: solid 1px var(--black_alt);
  padding-bottom: 10px;
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: calc(92vh - 42px);
}

footer {
  display: flex;
  justify-content: space-around;
  border-top: solid 1px var(--black_alt);
  padding: 10px;
}

.field {
  max-width: 200px;
  margin: 15px 0;
  border: solid 2px var(--black_alt);
  border-radius: 10px;
  padding: 15px 25px 10px;
}
.field > div, .word { position: relative; }
.word { translate: -10px; }

h2 {
  margin: -30px 0 10px;
  background-color: var(--black);
  color: var(--white_alt);
}

input{
  width: 100px;
  height: 20px;
  margin-bottom: 5px;
  border: solid 1px var(--black_alt);
  border-radius: 5px;
  text-align: left;
  color: var(--white_alt);
  padding: 1px 5px;
}

input::-webkit-outer-spin-button, input::-webkit-inner-spin-button, input[type=number] {
  -webkit-appearance: none;
  -moz-appearance: textfield;
}

button {
  cursor: pointer;
  width: 24px;
  height: 24px;
  border-radius: 5px;
  border: solid 1px;
}

.remove-word-button {
  position: absolute;
  margin-left: 5px;
  border-color: var(--red_alt);
  color: var(--red_alt);
}
.remove-word-button:hover {
  background-color: var(--red_alt);
  color: var(--black);
}

.letter { margin: 0 5px; }

.letter input {
  width: 20px;
  height: 20px;
}
.letter:has(input:not(:placeholder-shown)) span, .letter input:not(:placeholder-shown) {
  color: var(--blue_alt);
}

#letters {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-evenly;
}

#add-word {
  margin-top: 5px;
  border-color: var(--green_alt);
  color: var(--green_alt);
}
#add-word:hover {
  background-color: var(--green_alt);
  color: var(--black);
}

#remove-letters-value-button {
  width: 100%;
  color: var(--yellow);
  border: solid var(--yellow) 1px;
}
#remove-letters-value-button:hover {
  background-color: var(--yellow);
  color: var(--black);
}

#show-possibilities-button {
  width: 100%;
  height: 30px;
  margin-bottom: 5px;
  border: solid var(--green) 2px;
  font-size: 15px;
  font-weight: bold;
  color: var(--green);
}
#show-possibilities-button:hover {
  background-color: var(--green);
  color: var(--black);
}

#possibilities {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  margin: 20px;
}

#possibilities span {
  margin: 5px 2px;
  padding: 2px 5px;
  border: solid 1px var(--magenta_alt);
  border-radius: 10px;
}