style.css

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

:root {
  font-size: 62.5%;
}

body {
  font-size: 1.6rem;
  background-color: #1D191C;
  height: 100vh;
}

header {
  display: flex;
  padding: 4.8rem 4.8rem 0 4.8rem;;
  align-items: center;
  justify-content: space-between;
  /* background-color: #1d191c; */
  backdrop-filter: blur(10px);

  position: fixed;
  width: 100%;
  height: 20%;
}

button {
  background-color: transparent;
  padding: 1.6rem 2.4rem;
  color: #FECDD3;
  font-family: 'Inter';
  font-weight: 600;
  font-size: 1.6rem;
  line-height: 125%;

  border: 1px solid #FB7185;
  border-radius: .8rem;

  display: flex;
  align-items: center;
  gap: 1.2rem;
}

button:hover {
  background-color: #FDA4AF;
  color:#E11D48;
  border: #FDA4AF;

  cursor: pointer;
}

#form-habits {
  display: flex;
  padding: 18.2rem 4.8rem 4.8rem;
  width: fit-content;
}

.habits {
  display: flex;
  flex-direction: column;
  gap: .9rem;
  margin-top: 6.4rem;
  position: sticky;
  left: 0;
  backdrop-filter: blur(1.5px);
}

.habit {
  width: 6.4rem;
  height: 6.4rem;
  font-size: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.days {
  display: flex;
  margin-left: 1.5rem;
  gap:4.8rem;
}

.day {
  display: flex;
  flex-direction: column;
  gap: 2.9rem;
}

.day div {
  font-family: 'Roboto Mono';
  color: #FECDD3;
  font-size: 1.8rem;
  line-height: 125%;
  text-align: center;
  margin-bottom: 1.8rem;
}

input {
  appearance: none;
  -webkit-appearance: none;

  width: 4.5rem;
  height: 4.5rem;
  align-self: center;

  background:#2B232A;
  border: 2px solid #FDA4AF;
  border-radius: .8rem;
}

input:hover {
  background-color: #FECDD3;
  cursor: pointer;
}

input:checked {
  background: #E11D48;
  border: 2px solid #FDA4AF;
}

@media (max-width:570px) {
  button div{
    display: none;
  }
}