styles.css

* {
  font-family: "Arial", Arial, sans-serif;
  font-weight: 400;
  padding: 0;ь
  margin: 0;
  border: 0;
}
body {
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}
label, textarea {
  display: block;
}
.main {
  padding: 10px;
  width: 35%;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
.main-header {
  text-align: center;
  margin-bottom: 20px;
}
.main-input-comment { margin-bottom: 20px; }
.main-comment-area {
  width: 95%;
  border: #ced4da 1px solid;
  border-radius: 10px;
  resize: none;
  padding: 10px;
  margin-bottom: 10px;
  font-size: 16px;
}
.main-analyze-button {
  width: 100%;
  padding: 5px;
  border: 1px solid #007bff;
  background-color: #007bff;
  border-radius: 7px;
  color: white;
  text-align: center;
  font-size: 16px;
  outline: none;
}
.main-analyze-button::-moz-focus-inner {border: 0;}
.main-analyze-button:hover {
  background-color: #0069d9;
  border-color: #0069d9;
  cursor: pointer;
}
.main-result-block { text-align: center; }
.pos { color: green; }
.neg { color: darkred; }
.neutral { color: gray }
 
.invisible { display: none; }