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HTML 

              
                <div class="ui-week">
  <div class="ui-day" data-day="sun">
    <div class="ui-day-box">
      <div class="ui-bg" data-flip-key="bg-sun"></div>
      <div class="ui-grab -left"></div>
      <div class="ui-day-name" data-flip-key="sun"></div>
      <div class="ui-grab -right"></div>
    </div>
  </div>
  <div class="ui-day" data-day="mon">
    <div class="ui-day-box">
      <div class="ui-bg" data-flip-key="bg-mon"></div>
      <div class="ui-grab -left"></div>
      <div class="ui-day-name" data-flip-key="mon"></div>
      <div class="ui-grab -right"></div>
    </div>
  </div>
  <div class="ui-day" data-day="tue">
    <div class="ui-day-box">
      <div class="ui-bg" data-flip-key="bg-tue"></div>
      <div class="ui-grab -left"></div>
      <div class="ui-day-name" data-flip-key="tue"></div>
      <div class="ui-grab -right"></div>
    </div>
  </div>
  <div class="ui-day" data-day="wed">
    <div class="ui-day-box">
      <div class="ui-bg" data-flip-key="bg-wed"></div>
      <div class="ui-grab -left"></div>
      <div class="ui-day-name" data-flip-key="wed"></div>
      <div class="ui-grab -right"></div>
    </div>
  </div>
  <div class="ui-day" data-day="thu">
    <div class="ui-day-box">
      <div class="ui-bg" data-flip-key="bg-thu"></div>
      <div class="ui-grab -left"></div>
      <div class="ui-day-name" data-flip-key="thu"></div>
      <div class="ui-grab -right"></div>
    </div>
  </div>
  <div class="ui-day" data-day="fri">
    <div class="ui-day-box">
      <div class="ui-bg" data-flip-key="bg-fri"></div>
      <div class="ui-grab -left"></div>
      <div class="ui-day-name" data-flip-key="fri"></div>
      <div class="ui-grab -right"></div>
    </div>
  </div>
  <div class="ui-day" data-day="sat">
    <div class="ui-day-box">
      <div class="ui-bg" data-flip-key="bg-sat"></div>
      <div class="ui-grab -left"></div>
      <div class="ui-day-name" data-flip-key="sat"></div>
      <div class="ui-grab -right"></div>
    </div>
  </div>
</div>

<div class="ui-alert"><span class="ui-alert-days"></span><span> days removed</span></div>
<div class="ui-trash">
  <div class="ui-trash-lid"></div>
  <div class="ui-ridges"></div>
  <div class="ui-sparks">
    <div class="ui-spark"></div>
    <div class="ui-spark"></div>
    <div class="ui-spark"></div>
  </div>
</div>

<div class="ui-selection"></div>
!

CSS 

              
                $color-border: #9153FF;
$color-purple: #7960A7;
$color-box: #F7E3FF;
$color-text-dark: #7A61A7;

*, *:before, *:after {
  user-select: none;
}

body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: #F2F5F7;
  transform-style: preserve-3d;
  perspective: 1000px;
  perspective-origin: calc(var(--trash-x) * 1px) calc(var(--trash-y) * 1px);
  
  // &:before {
  //   content: attr(data-prev-state)' ➡ 'attr(data-state);
  //   position: absolute;
  //   top: 0;
  //   left: 0;
  // }
}

.ui-week {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  width: 70vw;
  height: 15vw;
  grid-column-gap: 1vw;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  margin-bottom: 10vh;
}

%selected {
  color: $color-border;
  background: transparent;
  
  > .ui-bg {
    border-color: $color-border;
    background-color: $color-box;
  }
}

.ui-day {
  justify-self: stretch;
  align-self: stretch;
  background-color: #EAEDF4;
  border-radius: .25rem;
  grid-row: 1 / 2;
  
  @for $i from 1 through 7 {
    &:nth-child(#{$i}) {
      grid-column: var(--start, #{$i}) / var(--end, span 1);
    }
  }
  
  .ui-day-name {
    color: $color-purple;
    &:before {
      content: attr(data-flip-key);
    }
  }
  
  &[data-state="selected"] > .ui-day-box,
  [data-state="disposed"] &:hover .ui-day-box {
    @extend %selected;
  }
  
  &[data-state="selected"] > .ui-day-box {
    animation: selected .6s cubic-bezier(.5, 0, .5, 1);

    @keyframes selected {
      50% {
        transform: rotate(2deg);
      }
    }
  }
  
  [data-state="dragging"] &[data-state="selected"],
  [data-state="disposed"] &[data-state="selected"] {    
    > .ui-day-box {
      z-index: 2;
      transition-duration: 0s;
      transform:
        translateX(calc((var(--drag-x2) - var(--drag-x1)) * 1px))
        translateY(calc((var(--drag-y2) - var(--drag-y1)) * 1px + (3px - var(--yc) * 3px)));
    }
  }
  
  [data-state="disposed"] &[data-state="selected"] > .ui-day-box {
    transition-duration: .3s;
    transform:
        translateX(calc((var(--drag-x2) - var(--drag-x1)) * 1px))
        translateY(calc((var(--drag-y2) - var(--drag-y1)) * 1px))
      translateZ(-1000px);
  }
}

.ui-day-box {
  display: flex;
  justify-content: center;
  align-items: center;
  text-transform: uppercase;
  font-weight: bold;
  border-radius: inherit;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition-duration: .3s;
  z-index: 1;
  pointer-events: none;
  
  > .ui-bg {
    background-color: #fff;
    border: 4px solid white;
    border-radius: inherit;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition-duration: .3s;
    transition-property: border-color, background-color;
    
    &:before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      box-shadow: 0 .5rem 1.5rem rgba($color-border, 0.2);
      z-index: -1;
    }
  }
}

[data-state="disposed"],
[data-state="grabbing"] {
  .ui-day[data-state="selected"] > .ui-day-box {
    opacity: 0;
    pointer-events: none;
  }
  
  .ui-day[data-state="grabbed"] > .ui-day-box {
    @extend %selected;
  }
  
  .ui-day-box {
    pointer-events: auto;
  }
}

.ui-grab {
  position: absolute;
  top: 0;
  height: 100%;
  width: 1vw;
  
  &.-left {
    left: 0;
  }
  
  &.-right {
    right: 0;
  }
}

.ui-grab, [data-state="grabbing"] {
  cursor: ew-resize;
}

.ui-selection {
  color: #7DDAFC;
  background: rgba(#7DDAFC, 0.3);
  border: 2px solid currentColor;
  position: absolute;
  left: calc(var(--mx1) * 1px);
  top: calc(var(--my1) * 1px);
  width: calc((var(--mx2) - var(--mx1)) * 1px);
  height: calc((var(--my2) - var(--my1)) * 1px);
  transition: opacity .3s ease-in-out;
  pointer-events: none;
  z-index: 3;
  
  [data-state]:not([data-state="selecting"]) & {
    opacity: 0;
  }
}

.ui-alert {
  color: #FF62A3;
  text-transform: uppercase;
  font-weight: bold;
  font-size: 1rem;
  white-space: nowrap;
  text-align: center;
  opacity: 0;
  
  [data-state="disposed"][data-prev-state="dragging"] &  {
    animation: alert 1s cubic-bezier(0, .5, 0, 1) both;
  }
  @keyframes alert {
    from {
      opacity: 0;
    }
    50% {
      opacity: 1;
    }
    to {
      transform: translateY(-200%);
      opacity: 0;
    }
  }
}

.ui-trash {
  width: 5vw;
  height: 6vw;
  border: 2px solid $color-purple;
  border-bottom: none;
  border-top: none;
  background-image: linear-gradient(to right, white, white 60%, lighten($color-purple, 45%) 61%, lighten($color-purple, 45%));
  opacity: 0;
  transform: translateY(1vw);
  
  &, > * {
    transition-property: opacity, transform;
    transition-duration: .6s;
    trasition-timing-function: cubic-bezier(.5, 0, .5, 1);
  }
  
  z-index: 10;
  
  [data-state="dragging"] & {
    opacity: 1;
    transform: none;
    
    &:hover {
      transform: rotate(-10deg);
      
      > .ui-trash-lid {
        transform: rotate(25deg);
      }
    }
  }
  
  [data-state="disposed"] & {
    transition-duration: 1s;
    opacity: 0;
  }
  
  &:before, &:after {
    content: '';
    position: absolute;
    width: calc(100% + 4px);
    left: -2px;
    height: 1vw;
    border: 2px solid $color-purple;
    border-bottom-left-radius: 100% 100%;
    border-bottom-right-radius: 100% 100%;
    background-image: inherit;
  }
  
  &:before {
    top: 100%;
    border-top: none;
    border-bottom-left-radius: 100% 100%;
    border-bottom-right-radius: 100% 100%;
  }
  &:after {
    bottom: calc(100% - .5vw);
    border-top-left-radius: 100% 100%;
    border-top-right-radius: 100% 100%;
  }
  
  > .ui-ridges {
    height: 70%;
    width: 2px;
    background-color: $color-purple;
    position: absolute;
    left: calc(50% - 1px);
    top: 25%;
    pointer-events: none;
    
    &:before, &:after {
      content: '';
      height: 100%;
      width: 100%;
      position: absolute;
      background-color: inherit;
    }
    &:before {
      left: -1.5vw;
      transform: rotate(-2deg);
    }
    &:after {
      left: 1.5vw;
      transform: rotate(2deg);
    }
  }
  
  .ui-spark {
    height: 6px;
    width: 6px;
    border-radius: 50%;
    background-color: $color-purple;
    position: absolute;
    top: -1vw;
    left: -1vw;
    opacity: 0;
    transition: transform 1s, opacity .1s;
    
    [data-state="dragging"] & {
      opacity: 0;
    }
    [data-state="disposed"] & {
      opacity: 1;
      transform: translate(-2vw, -1vw) scale(0);
      
      &:nth-child(2) {
        transform: translate(-2vw, -3vw) scale(0);
      }
      &:nth-child(3) {
        transform: translate(2vw, -1vw) scale(0);
      }
    }
    
    &:nth-child(2) {
      top: -1vw;
      left: 1vw;
    }
    &:nth-child(3) {
      top: -.5vw;
      left: 5vw;
    }
  }
}

.ui-trash-lid {
  position: absolute;
  bottom: calc(100% - .5vw);
  height: 1vw;
  width: 120%;
  left: -10%;
  border: 2px solid $color-purple;
  border-bottom-left-radius: 100% 100%;
  border-bottom-right-radius: 100% 100%;
  border-top-left-radius: 100% 100%;
  border-top-right-radius: 100% 100%;
  background-color: white;
  z-index: 1;
  transform-origin: 120% center;
  
  &:before, &:after {
    content: '';
    position: absolute;
    border: inherit;
    background-color: inherit;
  }
  
  &:before {
    width: 80%;
    height: 1vw;
    left: 10%;
    bottom: calc(100% - .4vw);
    border-radius: inherit;
  }
  
  &:after {
    width: 50%;
    left: 25%;
    height: 1.2vw;
    border-top-left-radius: 50% 100%;
    border-top-right-radius: 50% 100%;
    bottom: 107%;
    border-bottom: none;
    background-color: transparent;
  }
}

html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

*, *:before, *:after {
  box-sizing: border-box;
  position: relative;
}
!

JS 

              
                console.clear();

// safarIE
if (!('animate' in Element.prototype)) {
  Element.prototype.animate = () => {};
}

const dayEls = Array.from(document.querySelectorAll(".ui-day"));
const trashEl = document.querySelector(".ui-trash");
const rect = el => el.getBoundingClientRect();
const trashRect = rect(trashEl);
const center = el => {
  const elRect = rect(el);
  return [elRect.left + elRect.width / 2, elRect.top + elRect.height / 2];
};
const styleVars = (vars, el = document.documentElement) => {
  Object.keys(vars).forEach(key => {
    el.style.setProperty(`--${key}`, vars[key]);
  });
};

styleVars({
  "trash-x": trashRect.left,
  "trash-y": trashRect.top
});

// pretend it's redux, okay?
const extState = {
  selected: [],
  x1: 0,
  y1: 0,
  x2: 0,
  y2: 0,
  drag: {
    x1: 0,
    y1: 0,
    x2: 0,
    y2: 0
  },
  grabIndex: undefined,
  stretch: {},
  centers: dayEls.map(center)
};

const startSelection = (s, e) => ({
  x1: event.clientX,
  y1: event.clientY,
  x2: event.clientX,
  y2: event.clientY,
  selected: []
});

const updateSelection = (s, e) => {
  const mx1 = Math.min(s.x1, e.clientX);
  const mx2 = Math.max(s.x1, e.clientX);
  const my1 = Math.min(s.y1, e.clientY);
  const my2 = Math.max(s.y1, e.clientY);

  return {
    mx1,
    mx2,
    my1,
    my2,
    x2: e.clientX,
    y2: e.clientY,
    selected: extState.centers
      .map((center, i) => ({
        center,
        i
      }))
      .filter(({ center: [x, y], i }) => {
        return x > mx1 && x < mx2 && y > my1 && y < my2;
      })
      .map(({ i }) => i)
  };
};
 
const startDrag = (s, e) => ({
  drag: {
    type: e.type,
    index: e.index,
    x1: e.clientX,
    y1: e.clientY,
    x2: e.clientX,
    y2: e.clientY
  }
});

const drag = (s, e) => ({
  drag: {
    ...s.drag,
    x2: e.clientX,
    y2: e.clientY
  }
});

const isNotTrashElement = (s, e) => e.target !== trashEl;
const initGrab = (s, e) => ({
  grabIndex: e.index,
  stretchIndex: e.index
});
const updateGrab = (s, e) => {
  const { clientX } = e;
  const stretchIndexes = s.centers
    .map((c, i) => ({ c, index: i }))
    .filter(({ c: [x] }, i) => {
      return (
        s.selected.includes(i) &&
        ((s.grabIndex < i && clientX > x) ||
          (s.grabIndex > i && clientX < x)) &&
        Object.keys(s.stretch).every(key => {
          if (+key === +s.grabIndex) return true;

          const [min, max] = s.stretch[key];
          return key < s.grabIndex ? i > max : i < min;
        })
      );
    })
    .map(stretch => stretch.index);

  const start = Math.min(s.grabIndex, ...stretchIndexes);
  const end = Math.max(s.grabIndex, ...stretchIndexes);

  const prevRange = s.stretch[s.grabIndex];

  if (prevRange && prevRange[0] === start && prevRange[1] === end) {
    return;
  }

  flippingStyleVars(
    {
      start: start + 1,
      end: end + 2
    },
    dayEls[s.grabIndex]
  );

  return {
    stretch: {
      ...s.stretch,
      [s.grabIndex]: [start, end]
    }
  };
};
const showDaysRemoved = (s, e) => {
  const {selected} = s;
  const numDays = selected.length;
  
  document.querySelector('.ui-alert-days').innerHTML = numDays;
}

const resetGrab = () => ({ grabIndex: undefined });

const machine = xstate.Machine({
  initial: "start",
  states: {
    start: {
      on: {
        mousedown: {
          selecting: {
            actions: [startSelection]
          }
        }
      }
    },
    selecting: {
      on: {
        mouseup: "selected",
        mousemove: {
          selecting: {
            actions: [updateSelection]
          }
        }
      }
    },
    selected: {
      on: {
        mousedown: { selecting: { actions: [startSelection] } },
        drag: {
          dragging: {
            actions: [startDrag]
          }
        }
      }
    },
    dragging: {
      on: {
        mousemove: {
          dragging: {
            actions: [drag]
          }
        },
        mouseup: [
          { target: "selected", cond: isNotTrashElement },
          { target: "disposed", actions: [showDaysRemoved] }
        ]
      }
    },
    disposed: {
      on: {
        startGrab: {
          grabbing: {
            actions: [initGrab]
          }
        }
      }
    },
    grabbing: {
      on: {
        mousemove: {
          grabbing: {
            actions: [updateGrab]
          }
        },
        mouseup: {
          disposed: {
            actions: [resetGrab]
          }
        }
      }
    }
  }
});

let currentState = machine.initialState;

const flipping = new Flipping({
  activeSelector: el => el.matches('[data-state="grabbed"] *')
});

const flippingStyleVars = flipping.wrap(styleVars);

const send = event => {
  const state = machine.transition(currentState, event, extState);
  
  if (state.value !== currentState.value) {
    document.body.setAttribute("data-prev-state", currentState.value);
  }
  
  currentState = state;

  if (state.actions) {
    state.actions.reduce((extState, action) => {
      Object.assign(extState, action(extState, event) || {});
      return extState;
    }, extState);
  }

  document.body.setAttribute("data-state", currentState.value);
  const { mx1, my1, mx2, my2, drag, grabIndex, stretchIndex } = extState;

  styleVars({
    mx1,
    my1,
    mx2,
    my2,
    "drag-index": drag.index,
    "drag-x1": drag.x1,
    "drag-y1": drag.y1,
    "drag-x2": drag.x2,
    "drag-y2": drag.y2
  });

  dayEls.forEach((el, i) =>
    el.setAttribute(
      "data-state",
      extState.selected.includes(i) ? "selected" : ""
    )
  );

  if (extState.grabIndex !== undefined) {
    dayEls[extState.grabIndex].setAttribute("data-state", "grabbed");
  }
};

document.body.setAttribute("data-state", machine.initial);

document.body.addEventListener("mousedown", e => {
  send(e);
});

document.body.addEventListener("mouseup", e => {
  send(e);
});

document.body.addEventListener("mousemove", e => {
  send(e);
});

dayEls.forEach((el, i) => {
  styleVars({ yc: Math.abs(3 - i) }, el);
  el.addEventListener("mousedown", e => {
    if (e.target.matches('[data-state="selected"]')) {
      send({
        type: "drag",
        index: i,
        clientX: e.clientX,
        clientY: e.clientY
      });
    }
  });

  el.addEventListener("mouseover", e => {
    send({
      type: "mouseover",
      index: i
    });
  });

  Array.from(el.querySelectorAll(".ui-grab")).forEach(grabEl => {
    grabEl.addEventListener("mousedown", e => {
      send({
        type: "startGrab",
        index: i
      });
    });
  });
});

trashEl.addEventListener("mouseover", e => {
  send({ type: "prepareDispose" });
});
trashEl.addEventListener("mouseup", e => {
  send("dispose");
});
trashEl.addEventListener("mouseout", e => {
  send("cancelDispose");
});

// because someone will inevitably resize their screen
window.addEventListener('resize', e => {
  extState.centers = dayEls.map(center);
});
!
999px

Console