style.css

:root {
  box-sizing: border-box;
  font-size: calc(0.6em + 0.7vw);
  font-family: Helvetica, Arial, sans-serif;
}

* {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}
body {
  line-height: 1.2;
}

header {
  background-color: #eee;
  padding: 1em 1.3em;
}
.heading {
  display: flex;
  justify-content: center;
  align-items: baseline;
}

.heading h1 {
  margin-right: 1em;
  font-size: 3.18rem;
}
.buttons {
  display: flex;
  justify-content: space-evenly;
  margin-top: 1em;
}
button {
  padding: 0.3em 1em;
  font-size: 0.9rem;
  border-radius: 0.2em;
  color: #fff;
  border: none;
  cursor: pointer;
}
button.capital {
  background-color: rgb(15, 15, 221);
}
button.padstart {
  background-color: #999;
}
button.addup {
  background-color: rgb(30, 151, 30);
}
button.camelcase {
  background-color: rgb(230, 11, 11);
}
button.reverse {
  background-color: rgb(143, 143, 18);
}
button.trim {
  background-color: rgb(16, 128, 148);
}
button.repeat {
  background-color: black;
}
button.check {
  background-color: black;
}
.inputs {
  display: flex;
  justify-content: center;
  margin-top: 2em;
}
.input-filed {
  padding: 0.5em 0.8em;
}
.check {
  margin-left: 0.5em;
}
.main {
  padding: 1em 1.3em;
  display: flex;
}
.left {
  width: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  /* justify-content: center; */
}
pre {
  background-color: #d1d1d0;
  overflow: auto;
  font-family: "Monaco", monospace;
  padding: 0 1em;
}
.left {
  margin-left: 2rem;
}

code {
  font-family: Monaco, monospace;
  line-height: 100%;
  font-size: 1rem;
  background-color: #eee;
  padding: 0.2em;
  letter-spacing: -0.05em;
  word-break: normal;
  border-radius: 5px;
  padding: 1em 1.4em;
  margin-top: 1em;
  font-weight: 500;
}
/* .left .code {
  font-family: monospace;
  margin-top: 1em;
  background-color: rgba(14, 13, 13, 0.897);
  padding: 1em 1.4em;
  color: rgb(243, 239, 240);
  letter-spacing: 0.2em;
  font-size: 0.7rem;
  border-radius: 0.2em;
  /* font-style: italic; */
/* word-wrap: break-word; */
/* } */
*/ .right {
  width: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.right .answer {
  margin-top: 0.7em;
  background-color: #eee;
  padding: 1em 1.3em;
  font-size: 1.5rem;
  border-radius: 0.1em;
  font-weight: 400;
}
.footer {
  display: flex;
  align-items: baseline;
  margin-top: 3em;
  justify-content: center;
  color: rgb(94, 92, 92);
}