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HTML 

              
                <div class="container">

    <a href="#" class="button button--typeA">
        <div class="button__wrapper">
            <div class="material1"></div>
            <div class="material2"></div>
        </div>
        <span class="button__text">ENTRY</span>
        <div class="bird">
            <div class="block block_A">
                <div class="inner A_1"></div>
                <div class="inner A_2"></div>
            </div>
            <div class="block block_B">
                <div class="inner B_1"></div>
                <div class="inner B_2"></div>
            </div>
            <div class="block block_C">
                <div class="inner C_1"></div>
                <div class="inner C_2"></div>
            </div>
            <div class="block block_D"></div>
            <div class="block block_E">
                <div class="inner E_1"></div>
                <div class="inner E_2"></div>
            </div>
            <div class="block block_F">
                <div class="inner F_1"></div>
                <div class="inner F_2"></div>
            </div>
        </div>
    </a>


    <a href="#" class="button button--typeB">
        <div class="button__wrapper">
            <div class="material1"></div>
            <div class="material2"></div>
        </div>
        <span class="button__text">ENTRY</span>
        <div class="bird">
            <div class="block block_A">
                <div class="inner A_1"></div>
                <div class="inner A_2"></div>
            </div>
            <div class="block block_B">
                <div class="inner B_1"></div>
                <div class="inner B_2"></div>
            </div>
            <div class="block block_C">
                <div class="inner C_1"></div>
                <div class="inner C_2"></div>
            </div>
            <div class="block block_D"></div>
            <div class="block block_E">
                <div class="inner E_1"></div>
                <div class="inner E_2"></div>
            </div>
            <div class="block block_F">
                <div class="inner F_1"></div>
                <div class="inner F_2"></div>
            </div>
        </div>
    </a>


    <a href="#" class="button button--typeC">
        <div class="button__wrapper">
            <div class="material1"></div>
            <div class="material2"></div>
        </div>
        <span class="button__text">ENTRY</span>
        <div class="bird">
            <div class="block block_A">
                <div class="inner A_1"></div>
                <div class="inner A_2"></div>
            </div>
            <div class="block block_B">
                <div class="inner B_1"></div>
                <div class="inner B_2"></div>
            </div>
            <div class="block block_C">
                <div class="inner C_1"></div>
                <div class="inner C_2"></div>
            </div>
            <div class="block block_D"></div>
            <div class="block block_E">
                <div class="inner E_1"></div>
                <div class="inner E_2"></div>
            </div>
            <div class="block block_F">
                <div class="inner F_1"></div>
                <div class="inner F_2"></div>
            </div>
        </div>
    </a>

</div>
!

CSS 

              
                
.button--typeA{
    --mainColor   : #003c55 ;
    --subColor_1  : #e97100 ;
    --subColor_2  : #ff9b0a ;
    --accentColor : #cf005e ;
    --treeColor   : #7a5200 ;
    --skyColor    : #4aaeff ;
    --leafColor_1 : #008a49 ;
    --leafColor_2 : #00c94f ;
}
.button--typeB{
    --mainColor   : #7cba27 ;
    --subColor_1  : #94002c ;
    --subColor_2  : #ff5a5e ;
    --accentColor : #efad00 ;
    --treeColor   : #4a2a00 ;
    --skyColor    : #000645 ;
    --leafColor_1 : #cf8b00 ;
    --leafColor_2 : #f4b800 ;
}
.button--typeC{
    --mainColor   : #00c6d4 ;
    --subColor_1  : #ff9b0a ;
    --subColor_2  : #ffc26a ;
    --accentColor : #de8ccf ;
    --treeColor   : #af9667 ;
    --skyColor    : #ff7d5a ;
    --leafColor_1 : #57cf4f ;
    --leafColor_2 : #a9db74 ;
}

.button{
    position : relative ;
    width : 280px ;
    height : 80px ;
    border-radius : 40px 40px 4px 40px ;
    background : var(--treeColor) ;
    transition : all ease .3s ;
    box-shadow : 0 0 24px rgba(0,0,0,.2) ;
}
.button__wrapper{
    position : absolute ;
    z-index : 1 ;
    width : 100% ;
    height : 100% ;
    border-radius : 40px ;
}
.material1{
    position : absolute ;
    top : -45px ;
    right : -24px ;
    width : 64px ;
    height : 64px ;
    border-radius : 50% ;
    overflow : hidden ;
    transform : rotate(30deg) ;
}
.material2{
    position : absolute ;
    top : -44px ;
    right : 18px ;
    width : 48px ;
    height : 48px ;
    border-radius : 50% ;
    overflow : hidden ;
    transform : rotate(-40deg) ;
}
.material1::before{
    content : '' ;
    position : absolute ;
    top : 0 ;
    left : -50% ;
    width : 100% ;
    height : 100% ;
    border-radius : 50% ;
    background : var(--leafColor_1);
}
.material2::before{
    content : '' ;
    position : absolute ;
    top : 0 ;
    left : -50% ;
    width : 100% ;
    height : 100% ;
    border-radius : 50% ;
    background : var(--leafColor_2) ;
}
.button__text{
    display : flex ;
    justify-content : center ;
    align-items : center ;
    position : absolute ;
    z-index : 1 ;
    top : 0 ;
    right: 0 ;
    width : 160px ;
    height : 100% ;
    font-family: 'Paytone One', sans-serif;
    font-size : 32px ;
    color : #fff ;
    letter-spacing : 3px ;
    transition : all ease .3s ;
}
.bird{
    position : absolute ;
    z-index : 2 ;
    top : -80px ;
    left : -120px ;
    display : grid ;
    grid-template-columns : repeat(3 , 80px) ;
    grid-template-rows : repeat(3 , 80px) ;
    position : relative ;
    width : 240px ;
    height : 240px ;
    transition : all ease .3s ;
}
.block{
    position : relative ;
    display : flex ;
    width : 80px ;
    height : 80px ;
    box-sizing : border-box ;
    overflow : hidden ;
}
.block_A{
    grid-column : 1 / 2 ;
    grid-row : 1 / 2 ;
}
.block_B{
    grid-column : 2 / 3 ;
    grid-row : 1 / 2 ;
}
.block_C{
    grid-column : 3 / 4 ;
    grid-row : 1 / 2 ; 
}
.block_D{
    grid-column : 2 / 3 ;
    grid-row : 2 / 3 ;
}
.block_E{
    grid-column : 3 / 4 ;
    grid-row : 2 / 3 ;
}
.block_F{
    grid-column : 3 / 4 ;
    grid-row : 3 / 4 ;
}
.inner{
    position : absolute ;
    width : 80px ;
    height : 80px ;
    box-sizing : border-box ;
    overflow : hidden ;
    transition : all ease .4s ;
}
.inner::before,
.inner::after{
    content : '' ;
    position : absolute ;
}
/* A */
.A_1{
    top : 0 ;
    left : 0 ;
}
.A_2{
    transform-origin : top right ;
    bottom : -100% ;
    left : 0 ;
}
.A_2::before{
    z-index : 1 ;
    bottom : 0 ;
    left : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : var(--subColor_1) ;
}
.A_2::after{
    z-index : 2 ;
    bottom : 50% ;
    left : 50% ;
    width : 100% ;
    height : 100% ;
    border-radius : 50% ;
    background : var(--subColor_2) ;
}
.button:hover .bird .A_2{
    transform : rotate(90deg) ;
}
/* B */
.B_1{
    transform-origin : bottom right ;
    bottom : 0 ;
    right : 0 ;
}
.B_2{
    transform-origin : bottom right ;
    top : 0 ;
    left : -100% ;
}
.B_1::before{
    top : 0 ;
    left : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : var(--mainColor) ;
}
.B_1::after{
    bottom : 16px ;
    right : 16px ;
    margin : auto ;
    width : 16px ;
    height : 16px ;
    border-radius : 50% ;
    border : solid 4px var(--accentColor) ;
    background : #FFF ;
}
.B_2::before{
    top : 0 ;
    left : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : var(--mainColor) ;
}
.B_2::after{
    bottom : 16px ;
    right : 16px ;
    margin : auto ;
    width : 16px ;
    height : 16px ;
    border-radius : 50% ;
    border : solid 4px var(--accentColor) ;
    background : #FFF ;
}
.button:hover .bird .B_1{
    transform : rotate(-90deg) ;
}
.button:hover .bird .B_2{
    transform : rotate(90deg) ;
}
/* C */
.C_1{
    transform-origin : bottom left ;
    bottom : 0 ;
    left : 100% ;
}
.C_2{
    transform-origin : bottom left ;
    bottom : 0 ;
    left : 0 ;
}
.C_1::before{
    z-index : 1 ;
    top : 0 ;
    right : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : var(--mainColor) ;
}
.C_1::after{
    z-index : 2 ;
    top : 50% ;
    right : 50% ;
    width : 100% ;
    height : 100% ;
    border-radius : 50% ;
    background : var(--accentColor)  ;
}
.C_2::before{
    z-index : 1 ;
    top : 0 ;
    right : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : var(--subColor_1) ;
}
.C_2::after{
    z-index : 2 ;
    top : 50% ;
    right : 50% ;
    width : 100% ;
    height : 100% ;
    border-radius : 50% ;
    background : var(--subColor_2) ;
}
.button:hover .bird .C_1{
    transform : rotate(-90deg) ;
}
.button:hover .bird .C_2{
    transform : rotate(90deg) ;
}
/* D */
.block_D{
    width : 80px ;
}
.block_D::before{
    content : '' ;
    position : absolute ;
    z-index : 1 ;
    bottom : 0 ;
    left : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : var(--mainColor) ;
}
.block_D::after{
    content : '' ;
    position : absolute ;
    z-index : 2 ;
    bottom : 0  ;
    right : -25% ;
    width : 50% ;
    height : 50% ;
    border-radius : 50% ;
    background : #FFF ;
}
/* E */
.E_1{
    transform-origin : bottom left ;
    top : -100% ;
    right : 0 ;
}
.E_2{
    transform-origin :  bottom left;
    top : 0 ;
    left : 0 ;
}
.E_1::before{
    top : 0 ;
    right : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : #FFF ;
}
.E_1::after{
    bottom : -50% ;
    left : -50% ;
    width : 100% ;
    height : 100% ;
    border-radius : 50% ;
    background : var(--mainColor) ;
}
.E_2::before{
    top : 0 ;
    right : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : var(--mainColor) ;
}
.E_2::after{
    bottom : -50% ;
    left : -50% ;
    width : 100% ;
    height : 100% ;
    border-radius : 50% ;
    background : #FFF ;
}
.button:hover .bird .E_1{
    transform : rotate(90deg) ;
}
.button:hover .bird .E_2{
    transform : rotate(90deg) ;
}
/* F */
.F_2{
    transform-origin : top left ;
    top : 0 ;
    left : 0 ;
}
.F_2::before{
    bottom : 0 ;
    right : 0 ;
    width : 200% ;
    height : 200% ;
    border-radius : 50% ;
    background : var(--mainColor) ;
}
.F_2::after{
    bottom : 0 ;
    left : -50% ;
    width : 100% ;
    height : 100% ;
    border-radius : 0 0 40px 0 ;
    border-top : solid 36px #fff ;
    box-sizing : border-box ;
    background : var(--accentColor) ;
}
.button:hover .bird .F_2{
    transform : rotate(90deg) ;
}


.button:hover{
    border-radius : 40px 40px 40px 0 ;
    background : var(--skyColor) ;
}
.button:hover .button__wrapper{
    overflow : hidden ;
}
.button:hover .material1{
    border-radius : 0 ;
    top : 4px ;
    right : -64px ;
    width : 56px ;
    height : 24px ;
    transform : rotate(0) ;
    animation : cloud_move linear infinite 5s ;
}
.button:hover .material2{
    border-radius : 0 ;
    top : 56px ;
    right : -64px ;
    width : 56px ;
    height : 24px ;
    transform : rotate(0) ;
    animation : cloud_move linear infinite 5s 2s;
}
.button:hover .material1::before{
    top : 0 ;
    left : 0 ;
    width : 40px ;
    height : 12px ;
    border-radius : 10px ;
    background : #FFF ;
}
.button:hover .material2::before{
    top : 0 ;
    left : 0 ;
    width : 40px ;
    height : 12px ;
    border-radius : 10px ;
    background : #FFF ;
}
.button:hover .material1::after{
    content : '' ;
    position : absolute ;
    top : 8px ;
    right : 0 ;
    width : 24px ;
    height : 12px ;
    border-radius : 10px ;
    background : #FFF ;
}
.button:hover .material2::after{
    content : '' ;
    position : absolute ;
    top : 8px ;
    right : 0 ;
    width : 24px ;
    height : 12px ;
    border-radius : 10px ;
    background : #FFF ;
}
.button:hover .button__text{
    width : 220px ;
    letter-spacing : 6px ;
}
.button:hover .bird{
    left : -160px ;
}
@keyframes cloud_move{
    0%  { right : -64px ;}
    100%{ right : 280px ;}
}


/* 本体には関係ないスタイル */
.container{
    width : 100% ;
    height : 1000px ;
    display : flex ;
    flex-direction : column ;
    justify-content : center ;
    align-items : center ;
}
.button:not(:last-child){
    margin-bottom : 240px ;
}
!

JS
!
999px

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