.whatReward {
    background-color: #F9F6F1;
    color: #F36D25;
    font-weight: 700; 
    font-size: 20px;
    position: relative;
    letter-spacing: 0.025em;
}

.whatReward_title {
    letter-spacing: 0.12em;
    font-size: 5vw;
    padding-top: 8%;
    padding-bottom: 5%;
}

.whatReward_description {
    font-size: 4vw;
    padding-bottom: 12%;
}

.whatReward .first-triangle {
    position: relative;
}

.whatReward .downward-triangle:first-child {
    border-left: 100vw solid transparent;
    border-bottom: 17vw solid #FFFFFF; 
    top: 0;
    left: 0;
    width: 0;
    height: 0;
}

.whatReward .downward-triangle:last-child {
    position: absolute;
    border-right: 100vw solid transparent;
    border-bottom: 17vw solid #FFFFFF; 
    top: 0;
    left: 0;
    width: 0;
    height: 0;
}


  .whatReward .third-triangle .triangle_1 {
    position: absolute;
    bottom: 0;
    left: 0;
    border-bottom: 2vw solid transparent;
    border-top: 2vw solid transparent;
    border-left: 50vw solid #F9F6F1;
}

.whatReward .third-triangle .triangle_2 {
    position: absolute;
    bottom: 0;
    right: 0;
    border-top: 2vw solid transparent;
    border-bottom: 2vw solid transparent;
    border-right: 50vw solid #F36D25;
}

.whatReward .third-triangle .triangle_3 {
    position: absolute;
    border-left: 50vw solid transparent;
    border-right: 50vw solid transparent;
    border-bottom: 1.8vw solid  #FFFFFF; /* 三角形の色を変更するには、ここの色を変えてください。 */
    bottom: 0;
    left: 0;
  }

.second-triangle {
    position: relative;
}



  .whatReward .second-triangle .triangle_1 {
    top: 0;
    left: 0;
    border-bottom: 2vw solid transparent;
    border-top: 2vw solid transparent;
    border-left: 50vw solid #F36D25;
}

.whatReward .second-triangle .triangle_2 {
    position: absolute;
    top: 0;
    right: 0;
    border-top: 2vw solid transparent;
    border-bottom: 2vw solid transparent;
    border-right: 50vw solid #F9F6F1;
}

.whatReward .second-triangle .triangle_3 {
    position: absolute;
    border-left: 50vw solid transparent;
    border-right: 50vw solid transparent;
    border-top: 2vw solid #FFFFFF; /* 三角形の色を変更するには、ここの色を変えてください。 */
    top: 0;
    left: 0;
  }