.slidecontainer2 {
  width: 90%; /* Width of the outside container */
}

/* The slider itself */
.slider2 {
  -webkit-appearance: none;  /* Override default CSS styles */
  appearance: none;
  width: 100%; 
  height: 15px; /* Specified height */
  background: white; /* background */
  outline: none; /* Remove outline */
  opacity: 0.7; /* Set transparency (for mouse-over effects on hover) */
  -webkit-transition: .2s; /* 0.2 seconds transition on hover */
  transition: opacity .2s;
}

.slider2::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: red;
  cursor: pointer;
}