style.css

:root {
  --crimson: crimson;
  --dark-grey: #8d8d8d;
}
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: "Roboto", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

h1 {
  text-align: center;
  font-size: 3rem;
  text-shadow: 1px 1px 2px grey;
}

.grid {
  border-left: black solid 1px;
  border-bottom: black solid 1px;
  display: flex;
  flex-flow: column wrap;
  height: 500px;
  width: 500px;
  margin-inline: auto;
}

.grid-line {
  border-top: black solid 1px;
  display: flex;
  flex: 1;
  width: auto;
  flex-wrap: wrap;
}

.grid-item {
  border-right: black solid 1px;
  flex: 1;
}

.inputs {
  display: flex;
  flex-direction: column;
  text-align: center;
  gap: 1rem;
}

.inp_1 {
  display: flex;
  margin-top: 1rem;
  flex-direction: column;
  gap: 1rem;
}

.inp_2 {
  display: flex;
  flex-direction: column;
  align-items: center;
}

button {
  background-color: var(--crimson);
  border-radius: 8px;
  border: none;
  color: #ffffff;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  min-height: 40px;
  list-style: none;
  padding: 0.5em;
  position: relative;
  text-align: center;
  transition: color 100ms;
}

button:hover,
button:focus {
  background-color: rgb(228, 95, 121);
}


.slider {
  appearance: none;
  width: 250px;
  min-height: 25px;
  background: var(--dark-grey);
  outline: none;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  appearance: none;
  max-width: 25px;
  min-height: 25px;
  background: var(--crimson);
  cursor: pointer;
}

.slider::-moz-range-thumb {
  max-width: 25px;
  min-height: 25px;
  background: var(--crimson);
  cursor: pointer;
}

footer {
  justify-content: center;
  background-color: var(--crimson);
  text-shadow: 1px 1px 2px black;
  margin-top: auto;
  text-align: center;
  color: white;
  width: auto;
}

footer img{
 height: 1em;
}
footer a{
  text-decoration: none;
  color: aqua;
}

@media (max-width: 500px){
  .grid{
    height: 400px;
    width: 400px;
  }
}
@media (max-width: 400px){
  .grid{
    height: 300px;
    width: 300px;
  }
}