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CSS

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HTML
!

CSS 

              
                $breakpoints: (
    sm: 520px,
    md: 760px,
);

@mixin media($bp) {
  @media screen and (max-width: map_get($breakpoints, $bp)) {
    @content;
  }
}

body {
  width: 100vw;
  height: 100vh;
  font-family: 'Montserrat', sans-serif;
  background-color: #e6e8ec;
  display: flex;
  align-items: center;
  justify-content: center;
}

.graph {
  position: relative;
  background-color: white;
  margin: 2rem;
  width: 1000px;
  height: 400px;
  border-radius: 10px;
  box-shadow: 
    0 2px 10px rgba(0,0,0,0.01),
    0 4px 20px rgba(0,0,0,0.01),
    0 6px 40px rgba(0,0,0,0.01),
    0 8px 60px rgba(0,0,0,0.01)
}

.labels {
  display: flex;
  width: 100%;
  position: absolute;
  justify-content: space-between;
  left: 0;
  bottom: 0;
  box-sizing: border-box;
  
  div {
    margin: 1rem;
    color: #b7bbc8;
    
    @include media('sm') {
      font-size: 0.8rem;
      margin: 0.5rem;
    }
  }
}

.heading {
  position: absolute;
  top: 3rem;
  left: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1rem 0;
  align-items: flex-start;
  
  @include media('md') {
    top: 2rem;
    left: 2rem;
  }
  
  @include media('sm') {
    top: 1rem;
    left: 1rem;
  }
  
  .title {
    font-weight: bold;
    font-size: 3rem;
    color: #293155;
    
    @include media('sm') {
      font-size: 1.5rem;
    }
  }
  
  .subtitle {
    font-size: 1.2rem;
    color: #898fa3;
    
    @include media('sm') {
      font-size: 0.9rem;
    }
  }
}

.points {
  position: absolute;
  top: 0;
  
  div {
    --size: 3rem;
    position: absolute;
    width: var(--size);
    height: var(--size);
    top: var(--y);
    left: var(--x);
    transform: translate(calc(-0.5 * var(--size)), calc(-0.5 * var(--size)));
  }
}

.marker {
  position: absolute;
  top: var(--y);
  left: var(--x);
  bottom: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
  transform: translateX(-50%);
  
  .tooltip {
    position: absolute;
    transform: translateY(calc(-100% - 2rem));
    background-color: white;
    padding: 1rem;
    border-radius: 0.4rem;
    box-shadow: 
      0 2px 2px rgb(0 0 0 / 10%), 
      0 4px 10px rgb(0 0 0 / 10%);
    
    &::before, &::after {
      --size: 0.8rem;
      content: '';
      position: absolute;
      border: calc(var(--size) * 0.5) solid transparent;
      left: calc(50% - calc(var(--size) * 0.5));
    }
    
    &::before { // Arrow shadow
      bottom: calc(-1 * var(--size) - 2px);
      border-top-color: rgb(0 0 0 / 6%);
    }
    
    &::after { // Arrow
      bottom: calc(-1 * var(--size));
      border-top-color: white;
    }
    
    span:first-child {
      color: #b7bbc8;
      padding-right: 1rem;
    }
    
    span:last-child {
      border-left: 1px solid #b7bbc8;
      padding-left: 1rem;
    }
  }
  
  .circle {
    position: absolute;
    top: 0;
    flex-shrink: 0;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 1rem;
    background-color: var(--color);
    border: 0.7rem solid white;
    transform: translateY(-50%);
    box-shadow: 
      0 1px 5px rgb(0 0 0 / 10%),
      0 2px 15px rgb(0 0 0 / 10%);
  }
  
  .line {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 1px;
    background-color: #ccd3e7;
  }
}

.legend {
  position: absolute;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 0 1rem;
  margin: 3rem;
  
  @include media('md') {
    justify-content: flex-end;
    margin: 2rem;
  }
  
  @include media('sm') {
    margin: 1rem;
    font-size: 0.8rem;
  }
  
  > div {
    display: flex;
    color: #898fa3;
  }

  span {
    display: block;
    background-color: var(--color);
    width: 1rem;
    height: 1rem;
    border-radius: 1rem;
    margin-right: 0.5rem;
  }
}

svg {
  width: 100%;
  height: 100%;
  transform: scaleY(-1); // Change to cartesian coordinate system
  
  path {
    vector-effect: non-scaling-stroke;
  }
  
  .stroke {
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-width: 0.15rem;
    pointer-events: none;
  }
  
  .gradient {
    pointer-events: none;
  }
}
!

JS 

              
                import React, {useState, useRef} from 'https://cdn.skypack.dev/react';
import ReactDOM from 'https://cdn.skypack.dev/react-dom';
import {useDimensions} from 'https://cdn.skypack.dev/webrix@1.5.9/hooks';

const DATA = [
  [1131, 1604, 1240, 1731, 1304, 2101, 1701],
  [708, 1401, 1140, 1503, 1020, 1751, 902],
];

const COLORS = ['#00baf0', '#5637f4'];
const LABELS = ['JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL'];

const Line = ({path, color}) => {
  const dx = 100 / (path.length - 1);
  const d = `M0,${path[0]} ${path.slice(1).map((p, i) => (
    `C${dx*i + dx/2},${path[i]} `+
    `${dx*(i+1) - dx/2},${path[i+1]} `+
    `${dx*(i+1)},${path[i+1]} `
  )).join(' ')}`;
  return (
    <>
      <path stroke={color} d={d} fill='none' className='stroke'/>
      <path d={d+` V0 H0 Z`} fill={`url(#gradient-${color})`} className='gradient'/>
      <defs>
        <linearGradient id={`gradient-${color}`} x1='0' x2='0' y1='0' y2='1'>
          <stop offset='0%' stopColor={color} stopOpacity={0}/>
          <stop offset='100%' stopColor={color} stopOpacity={0.15}/>
        </linearGradient>
       </defs>
    </>
  );
}

const Points = ({data, width, height, setActive, range}) => {
  const timeout = useRef();
  const dr = Math.abs(range[1] - range[0]);
  const activate = (path, point) => {
    clearTimeout(timeout.current);
    setActive({path, point});
  }
  const deactivate = (path, point) => {
    clearTimeout(timeout.current);
    timeout.current = setTimeout(() => {
      setActive(cur => {
        if (cur.path === path && cur.point === point) {
          return null;
        }
        return cur;
      });
    }, 200);
  }
  return (
    <div className='points'>
      {data.map((row, r) => row.map((y, i) => (
        <div style={{'--x': `${i * width / (row.length - 1)}px`, '--y': `${height - y * (height / dr)}px`}} onMouseEnter={() => activate(r, i)} onMouseLeave={() => deactivate(r, i)}/>
      )))}
    </div>
  );
}

const Legend = ({labels, colors}) => (
  <div className='legend'>
    {labels.map((l, i) => (
      <div key={l}><span style={{'--color': colors[i]}}/>{l}</div>
    ))}
  </div>
);

const Marker = ({colors, labels, data, active, width, height, range}) => {
  const {path, point} = active || {};
  const value = data[path]?.[point];
  const dr = Math.abs(range[1] - range[0]);
  return (
    <div className='marker' style={{
        opacity: active ? 1 : 0,
        '--color': colors[path], 
        '--x': `${point * width / (data[path]?.length - 1)}px`,
        '--y': `${height - value * (height / dr)}px`
      }}>
      <div className='tooltip'>
        <span>{labels[point]}</span>
        <span>${value?.toLocaleString?.()}</span>
      </div>
      <div className='line'/>
      <div className='circle'/>
    </div>
  );
}

const Graph = ({data, colors, range, labels, title, subtitle, legend}) => {
  const [active, setActive] = useState({path: 1, point: 2});
  const graph = useRef();
  const {width, height} = useDimensions(graph);
  return (
    <div className='graph' ref={graph}>
      <div className='heading'>
        <div className='title'>{title}</div>
        <div className='subtitle'>{subtitle}</div>
      </div>
      <Marker colors={colors} data={data} active={active} labels={labels} width={width} height={height} range={range}/>
      <Legend colors={colors} labels={legend}/>
      <svg viewBox={`0 ${range[0]} 100 ${range[1]}`} preserveAspectRatio='none'>
        {data.map((path, i) => (
          <Line key={i} path={path} color={colors[i]}/>
        ))}
      </svg>
      <div className='labels'>
        {labels.map(label => (
          <div key={label}>{label}</div>
        ))}
      </div>
      <Points data={data} width={width} height={height} setActive={setActive} range={range}/>
    </div>
  );
};

const App = () => (
  <Graph data={DATA} colors={COLORS} range={[0, 3000]} labels={LABELS} title='$11,3K' subtitle='YTD Revenue' legend={['Stream A', 'Stream B']}/>
);

ReactDOM.render(
  <App/>,
  document.body
);
!
999px

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