html-js-css-clocks/main.css

body{
  background-color: #000;
  margin: 0;
  color: #fff;
  font-family: "Fira Code";
}
nav{
  display: flex;
  font-weight: 300;
  height: 5vh;
  width: 100vw;
}
svg{
  height: 100%;
  width: 100%;
}
button{
  background: none;
  border: none;
  color: #fff;
}
#s_start, #s_reset, #timer_button{
  height: 42px;
  width: 42px;
}
.select{
  display: flex;
  height: 90%;
  justify-content: center;
  width: inherit;
  cursor: pointer;
}
.select.thing:before{
  content: "";
  height: 2px;
  margin-top: 5vh;
  background-color: white;
  position: absolute;
  width: 5%;
}
#clocks, #stopwatch, #timer{
  display: none;
  text-align: center;
  justify-content: center;
  height: 95vh;
}
#clocks.show, #stopwatch.show, #timer.show{
  display: block;
}
.time{
  font-size: 12vw;
  margin: 0;
}
#main_time, #main_sw, #main_t{
  margin: 0;
}
#msec_time, #msec_sw, #msec_t{
  font-size: 2vw;
  margin: 0;
}
#date{
  margin: 0;
  font-size: 2.25vw;
  font-weight: 300;
  justify-content: center;
  display: flex;
  align-items: center;
}
.timer_input{
  width: 30px;
  background: none;
  color: #fff;
  font-family: "Fira Code";
}
#analog, #sanalog, #tanalog{
  width: 50vmin;
  height: 50vmin;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  background: url("res/clockface.png");
  background-size: cover;
}
#hour, #min, #sec, #shour, #smin, #ssec, #thour, #tmin, #tsec{
  display: flex;
  position: absolute;
  justify-content: center;
}
#hour, #shour, #thour{
  width: 30vmin;
  height: 30vmin;
}
#min, #smin, #tmin{
  width: 40vmin;
  height: 40vmin;
}
#sec, #ssec, #tsec{
  width: 45vmin;
  height: 45vmin;
}
#hour::before, #shour::before, #thour::before{
  content: "";
  position: absolute;
  background-color: yellow;
  width: 9px;
  height: 50%;
  z-index: 10;
}
#min::before, #smin::before, #tmin::before{
  content: "";
  position: absolute;
  width: 5px;
  height: 50%;
  background-color: #fff;
  z-index: 11;
}
#sec::before, #ssec::before, #tsec::before{
  content: "";
  position: absolute;
  width: 3px;
  height: 55%;
  background-color: #f00;
  z-index: 12;
}