styles.css

@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600&display=swap");

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

a {
  text-decoration: none;
}

:root {
  --primary-color: #7c3aed;
}

body {
  font-family: "Montserrat", sans-serif;
  min-width: 100vw;
}

/* Container */
.container {
     margin: 4rem auto 8rem;
     text-align: center;
   }

   .heading {
     color: var(--primary-color);
   }
   .description {
     font-size: larger;
     margin: 1rem;
   }
   .input-label {
     display: block;
     font-size: large;
     font-weight: 600;
   }
   .input {
     font-size: 14px;
     outline: #fff;
     padding: 0.6rem 1rem;
     margin: 1rem;
     border: 2px solid var(--primary-color);
     border-radius: 0.5rem;
     width: 100%;
     max-width: 258px;
   }
   #check-button {
     background: var(--primary-color);
     border: none;
     color: #fff;
     padding: 0.7rem 1rem;
     border-radius: 0.5rem;
     font-size: large;
     cursor: pointer;
     outline: #fff;
     margin: auto;
     display: block;
   }
   #error-message {
     display: block;
     font-size: larger;
     margin: 1rem 0 0;
   }
   /* Table */
   .change-table {
     width: 50%;
     text-align: justify;
     border-collapse: collapse;
     margin: auto;
   }
   .change-table caption {
     margin: 1rem auto;
     font-size: x-large;
     font-weight: 500;
   }
   th,
   td {
     border: 2px solid var(--primary-color);
     width: 0%;
     border-collapse: collapse;
     padding: 0.4rem;
   }