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HTML 

              
                <section class="my-day">
  <header>
    <div class="icon">
      <svg width="32" height="32" viewBox="0 0 32 32" fill="none" xmlns="http://www.w3.org/2000/svg">
        <path d="M4.12352 12.5391H27.8888" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M21.9228 17.7464H21.9351" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M16.0062 17.7464H16.0185" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M10.0772 17.7464H10.0895" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M21.9228 22.9283H21.9351" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M16.0062 22.9283H16.0185" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M10.0772 22.9283H10.0895" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M21.3916 2.66675V7.05445" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path d="M10.6207 2.66675V7.05445" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
        <path fill-rule="evenodd" clip-rule="evenodd" d="M21.651 4.77246H10.3613C6.4457 4.77246 4 6.95371 4 10.9632V23.0294C4 27.1019 6.4457 29.3335 10.3613 29.3335H21.6387C25.5666 29.3335 28 27.1397 28 23.1302V10.9632C28.0123 6.95371 25.579 4.77246 21.651 4.77246Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" />
      </svg>
    </div>
    <h2>My Day</h2>
    <p>
      3 Events
    </p>
  </header>
  <div class="calendar">
    <div class="calendar__hour-grid">
      <template id="template-hour">
        <div class="calendar__hour">
          <p class="label"></p>
        </div>
      </template>
    </div>
    <div class="calendar__events">
      <template id="template-event">
        <div class="calendar__event">
          <p class="label"></p>
        </div>
      </template>
    </div>
  </div>
</section>
!

CSS 

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

html {
  font-size: 14px;
  line-height: 1.2;
  font-family: "Lato", sans-serif;
  font-weight: var(--fw-base);
}

:root {
  --bg-root: rgb(66, 68, 87);

  --bg-primary-rgb: 32, 33, 42;
  --bg-primary: rgb(var(--bg-primary-rgb));
  --bg-secondary: rgb(55, 57, 63);
  --bg-tertiary: rgb(40, 41, 50);

  --hi-success: rgb(17, 201, 0);
  --hi-warning: rgb(255, 147, 5);
  --hi-danger: rgb(255, 0, 126);
  --hi-primary: rgb(138, 149, 255);
  --hi-secondary: rgb(90, 104, 242);
  --bg-hi: radial-gradient(
    74% 185% at -3% 0%,
    var(--hi-secondary) 0%,
    var(--hi-primary) 100%
  );

  --fg-primary: rgb(233, 233, 233);
  --fg-secondary: rgba(131, 133, 137);

  --fw-sm: 500;
  --fw-base: 700;

  --sp-base: 16px;
  --sp-sm-1: calc(7 / 8 * var(--sp-base));
  --sp-sm-2: calc(6 / 8 * var(--sp-base));
  --sp-sm-3: calc(5 / 8 * var(--sp-base));
  --sp-sm-4: calc(4 / 8 * var(--sp-base));
  --sp-sm-5: calc(3 / 8 * var(--sp-base));
  --sp-sm-6: calc(2 / 8 * var(--sp-base));
  --sp-sm-7: calc(1 / 8 * var(--sp-base));
  --sp-lg-7: calc((1 + 7 / 8) * var(--sp-base));
  --sp-lg-6: calc((1 + 6 / 8) * var(--sp-base));
  --sp-lg-5: calc((1 + 5 / 8) * var(--sp-base));
  --sp-lg-4: calc((1 + 4 / 8) * var(--sp-base));
  --sp-lg-3: calc((1 + 3 / 8) * var(--sp-base));
  --sp-lg-2: calc((1 + 2 / 8) * var(--sp-base));
  --sp-lg-1: calc((1 + 1 / 8) * var(--sp-base));

  /* major third scale
     factor: 1.250 */
  --fs-sm-1: 0.8rem;
  --fs-base: 1rem;
  --fs-lg-1: 1.25rem;
  --fs-lg-2: 1.563rem;
  --fs-lg-3: 1.953rem;
  --fs-lg-4: 2.441rem;  

  --bd-radius: 24px;
  --bd: 1px solid var(--bg-secondary);

  --transition: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

.calendar {
  --left-margin: var(--sp-base);
  --hours: calc(var(--end-hour)
    - var(--start-hour));
  --rows: calc(
    var(--resolution) * var(--hours)
  );

  position: relative;
}

body {
  background: var(--bg-root);

  display: grid;
  place-content: center;

  padding: var(--sp-base);

  color: var(--fg-primary);
}

section {
  --icon-size: 58px;
  --padding: var(--sp-lg-1);

  background: var(--bg-tertiary);
  border: var(--bd);
  border-radius: var(--bd-radius);

  display: grid;
  grid-template-rows: max-content 1fr;
} 

section > header {
  display: grid;
  grid-template-columns: max-content 1fr;
  grid-template-rows: repeat(2, 1fr);
  gap: var(--sp-sm-1);
  grid-template-areas:
    "icon header"
    "icon sub-header";

  padding: var(--padding);
}

section > header > .icon {
  grid-area: icon;

  display: grid;
  place-content: center;
  border-radius: calc(2 / 3 * var(--bd-radius));

  width: var(--icon-size);
  height: var(--icon-size);

  background: var(--bg-primary);
  color: var(--hi-primary);
}

section > header > h2 {
  grid-area: header;

  font-size: var(--fs-lg-1);
  align-self: end;
}

section > header > p {
  grid-area: sub-header;

  font-weight: var(--fw-sm);
}

section > *:nth-child(2) {
  margin: 0 var(--padding) var(--padding);
  place-self: stretch;
}

section {
  width: 20rem;
  height: 40rem;
}

.calendar > * {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
}

.calendar__hour-grid {
  display: grid;
  grid-auto-flow: row;
  grid-auto-rows: 1fr;
}

.calendar__hour {
  border-top: 1px dashed var(--bg-secondary);
}

.calendar__hour:last-child {
  border-bottom: 1px dashed var(--bg-secondary);
}

.calendar__hour > .label {
  font-size: var(--fs-sm-1);
  line-height: 2.5;
}

.calendar__hour.active {
  position: relative;

  color: var(--hi-primary);
}

.calendar__hour.active::before {
  content: "";

  position: absolute;

  left: calc(1.5 * var(--left-margin));
  right: 0;
  height: 1px;
  top: calc(100% * var(--current-minute) / 60);

  border-bottom: 2px dashed var(--hi-primary);
}

.calendar__events {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: repeat(var(--rows), 1fr);

  left: calc(2 * var(--left-margin));
}

.calendar__event {
  --start: 0;
  --end: 0;
  --start-row: ;

  grid-row-start: calc(
    (var(--start) - var(--start-hour))
    * var(--resolution)
    + 1
  );
  grid-row-end: calc(
    (var(--end) - var(--start-hour))
    * var(--resolution)
    + 1
  );

  padding: var(--sp-sm-2);
  border-radius: calc(2 / 3 * var(--bd-radius));

  background: var(--bg-hi);
}

.calendar__event > .label {
  font-weight: var(--fw-sm);
}

.calendar__event.past {
  background: var(--bg-primary);
}
!

JS 

              
                const startHour = 8;
const endHour = 18;
const resolution = 2;
const currentHour = 12;
const currentMinute = 25;


const hourTemplate = document.querySelector(
  '#template-hour');
const hourGrid = document.querySelector(
  '.calendar__hour-grid');
for (let i = startHour; i < endHour; i++) {
  const hourNode = hourTemplate.content
    .firstElementChild.cloneNode(true);
  hourGrid.appendChild(hourNode);

  hourNode.querySelector('.label')
    .innerText = `${i}`.padStart(2, '0');

  if (currentHour === i) {
    hourNode.classList.add('active');
    hourNode.style.setProperty(
      '--current-minute', currentMinute
    );
  }
}

const events = [
  {
    start: 8,
    end: 10,
    title: 'Focus Time',
    past: true,
  },
  {
    start: 10.5,
    end: 11.5,
    title: '1:1 with Tamika',
    past: true,
  },
  {
    start: 14,
    end: 15,
    title: 'Technical Weekly',
  },
];
const eventTemplate = document
  .querySelector('#template-event');
const calendarEvents = document
  .querySelector('.calendar__events');
const calendar = document
  .querySelector('.calendar');

calendar.style.setProperty(
  '--start-hour', startHour);
calendar.style.setProperty(
  '--end-hour', endHour);
calendar.style.setProperty(
  '--resolution', resolution);

events.forEach((event) => {
  const eventNode = eventTemplate.content
    .firstElementChild.cloneNode(true);
  calendarEvents.appendChild(eventNode);

  eventNode.querySelector('.label')
    .innerText = event.title;
  eventNode.style.setProperty(
    '--start', event.start);
  eventNode.style.setProperty(
    '--end', event.end);
  if (event.past) {
    eventNode.classList.add('past');
  }
});
!
999px

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