style.css

html {
  font-family: roboto;
}

#fitz {
  font-family: sans-serif;
  font-weight: 500;
  background-color: rgba(232, 236, 46, 0.984);
  color: rgb(10, 106, 56);
}

:root {
  --red: #f3baba;
  --red__border--outset: 4px outset #f6bbbb;
  --red__border--inset: 4px inset #f3baba;
  --blue: #cee5ec;
  --blue__border--outset: 4px outset #cee5ecb3;
  --blue__border--inset: 4px inset #cee5ecb3;
  --gray: #dadada;
  --gray__border--outset: 4px outset #dadadab3;
  --gray__border--inset: 4px inset #dadadab3;
  --light_gray: #e9e9e9;
  --light_gray__border--outset: 4px outset #e9e9e9b3;
  --light_gray__border--inset: 4px inset #e9e9e9b3;
  --green: #8ee18e;
  --green__border--outset: 4px outset #8ee18eb3;
  --green__border--inset: 4px inset #8ee18eb3;
}

@media (max-width: 480px) {
  #calc__grid--container {
    margin-top: 2em;
  }
  #pad,
  #result {
    min-height: 2em;
  }
}

#calc__grid--container {
  margin: auto;
  margin-top: 4em;
  padding: 10px;
  background-color: #f0f0f0;
  max-width: 300px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  justify-content: center;
  gap: 0.4em;
  border: 0.15em solid #3538cf;
  border-radius: 2%;
}

.square,
#zero,
#equals,
#all_clear {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.8rem;
  font-weight: 600;
  user-select: none;
}

/* ==== Set Grid Items to Squares */
.square {
  aspect-ratio: 1;
}

/* ==== #pad and #result - grid output items, set height */
#pad,
#result {
  min-height: 2.3em;
  display: flex;
  justify-content: end;
  align-items: center;
  padding-right: 0.1em;
  font-size: 1.7rem;
  background-color: #fafafa;
  border: 4px inset #fafafa66;
}

/* ==== Styles for Hover over Input Grid Items */

.erase:hover,
.number:hover,
.math:hover,
#decimal:hover,
#equals:hover {
  scale: 1.04;
}

/* ==== Styles for Input Grid Items */

.math,
#equals {
  font-size: 2.5rem;
  font-weight: 500;
}
#percentage {
  font-size: 2rem;
  font-weight: 100;
}

.number {
  background-color: var(--gray);
  border: var(--gray__border--outset);
}
.number:active {
  border: var(--gray__border--inset);
}

#decimal {
  background-color: var(--light_gray);
  border: var(--light_gray__border--outset);
}
#decimal:active {
  border: var(--light_gray__border--inset);
}

.math,
#equals {
  background-color: var(--blue);
  border: var(--blue__border--outset);
}

.math:active {
  border: var(--blue__border--inset);
}

.erase {
  background-color: var(--red);
  border: var(--red__border--outset);
}
.erase:active {
  border: var(--red__border--inset);
}

#equals {
  background-color: var(--green);
  border: var(--green__border--outset);
}
#equals:active {
  border: var(--green__border--inset);
}

/* ==== Calculator Display Top Two Rows Positioning */

#clear {
  grid-column: 1;
  grid-row: 1;
}
#pad {
  grid-column: 2 / span 3;
  grid-row: 1 / span 1;
}

#all_clear {
  grid-column: 1;
  grid-row: 2;
}
#result {
  grid-column: 2 / span 3;
  grid-row: 2 / span 1;
}

/* ==== Calculator Inputs Grid Line Positioning */

#percentage {
  grid-column: 2;
  grid-row: 3;
}
#multiply {
  grid-column: 3;
  grid-row: 3;
}
#divide {
  grid-column: 4;
  grid-row: 3;
}

#seven {
  grid-column: 1;
  grid-row: 4;
}
#eight {
  grid-column: 2;
  grid-row: 4;
}
#nine {
  grid-column: 3;
  grid-row: 4;
}
#minus {
  grid-column: 4;
  grid-row: 4;
}

#four {
  grid-column: 1;
  grid-row: 5;
}
#five {
  grid-column: 2;
  grid-row: 5;
}
#six {
  grid-column: 3;
  grid-row: 5;
}
#plus {
  grid-column: 4;
  grid-row: 5;
}

#one {
  grid-column: 1;
  grid-row: 6;
}
#two {
  grid-column: 2;
  grid-row: 6;
}
#three {
  grid-column: 3;
  grid-row: 6;
}

#zero {
  grid-column: 1 / span 2;
  grid-row: 7;
}
#decimal {
  grid-column: 3;
  grid-row: 7;
}
#equals {
  grid-column: 4;
  grid-row: 6 / span 2;
}

/* ==== Footer */

#copyright__flex--container {
  margin-top: 0.5em;
  display: flex;
  justify-content: center;
  column-gap: 7em;
  font-size: 0.7rem;
}
.fa-github:hover {
  scale: 3;
  rotate: 1 1 1 45deg;
  translate: 10px;
}