style.css

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

body {
  background-color: #f6f6f9;
  width: 100%;
  height: 100%;
  overflow-x: hidden;
}

#header{
    width: 100%;
    background: #000;
    padding: 1rem 2rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo{
  color: white;
  font-size: 1.2rem;
  text-transform: uppercase;
}
header input, .button{
    font-size: 1.2rem;
    padding: 10px 20px;
}


.node circle {
  fill: #fff;
  stroke: black;
  stroke-width: 3px;
}
.node text { 
  font: 16px sans-serif;
  text-anchor: middle; /* Center-align text */
  dominant-baseline: middle; /* Center-align text vertically */
}
.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}
button.activeBtn, button:hover{
  background: black;
  color: white;
  border-radius: 5px;
}

.container{
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: .5rem;
}
.container h2{
  border: 1px solid black;
  padding: .5rem 1rem;
  margin-bottom: 1rem;
}
#inputArray{
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: .5rem;
}
#inputArray div{
  border: 1px solid black;
  font-size: 1rem;
  padding: .5rem;
}