#button-send {
    position: absolute;
    width: 35px;
    height: 35px;
    top: 50%;
    right: 5px;
    transform: translateY(-50%);
    border-radius: 100%;
}

#search-input{
    border-radius: 500px;
}

#mode-nuit {    
    position: absolute;
    top: 15px;
    right: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
}

#mode-nuit input[type="checkbox"] {
  opacity: 0;
  position: absolute;
}

#mode-nuit label {
  width: 3.6rem;
  height: 1.8rem;
  background-color: #ccc;
  border-radius: 1rem;
  position: relative;
  cursor: pointer;
  transition: background-color .3s ease;
}

#mode-nuit label::after {
  content: "";
  position: absolute;
  top: .2rem;
  left: .2rem;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background-color: #fff;
  box-shadow: 0 0 3px rgba(0,0,0,.3);
  transition: left .3s ease, background-color .3s ease;
}

#mode-nuit input:checked + label {
  background-color: #343a40;
}

#mode-nuit input:checked + label::after {
  left: 2rem;
  background-color: #f8f9fa;
}

body.mode-jour {
  background-color: #f8f9fa;
  color: #212529;
  transition: background-color .5s ease, color .5s ease;
}

body.mode-nuit {
  background-color: #121212;
  color: #f1f1f1;
  transition: background-color .5s ease, color .5s ease;
}