.max-w1200 {
max-width: 1200px;
margin: 0 auto;
}

.ach-reward-h3 {
background: #F9F8F1;
margin: 2rem 0rem;
}

.ach-reward-h3 img {
width: 95%;
margin: 0 auto;
text-align: center;
display: block;
padding: 2rem 0rem;
}

.ach-reward-box {
position: relative;
color: #4B4204;
background: #F9F8F1;
border: solid 2px #4B4204;
padding: 1.5rem;
font-size: 14px;
line-height: 2;
}

.ach-reward-box::before {
content: '';
position: absolute;
display: inline-block;
background-size: contain;
transform: translateX(-50%)translateY(-50%);
background-repeat: no-repeat;
}

.ach-reward-box::before {
background-image: url('https://pokewaku.jp/wp-content/themes/blankslate-child/assets/images/ach-reward-3.svg');
}

.ach-reward-box::before {
top: -20px;
left: 95%;
width: 110px;
height: 110px;
}

.ach-reward-table {
width: 100%;
margin-bottom: 40px;
}

.ach-reward-table td {
width: calc(100%/2);
text-align: center;
padding: 0.3rem;
border: dotted 2px;
font-size: 12px;
}

.ach-reward-table td:nth-child(1) {
background: #4B4204;
color: #fff;
}

.ach-reward-table td:nth-child(2) {
background: #F9F8F1;
color: #4B4204;
}

@media screen and (max-width: 1199px) {
.ach-reward-h3 img {
margin-bottom: -50px;
}
.ach-reward-flex {
margin: 2rem;
}
.ach-reward-box {
margin-top: 40px;
}
}

@media screen and (min-width: 1200px) {
.ach-reward-h3 img {
max-width: 600px;
margin: 0 auto;
text-align: center;
display: block;
padding: 2rem 0rem;
}
.ach-reward-box {
width: 50%;
margin-left: 40px;
padding: 2rem;
font-size: 16px;
}
.ach-reward-box::before {
top: -25px;
left: 97%;
width: 150px;
height: 150px;
}
.ach-reward-table td {
padding: 0.5rem;
font-size: 16px;
}
.ach-reward-flex {
display: flex;
margin: 40px 0px;
align-items: center;
}
.wid-pc-60 {
width: 55%;
padding-right: 50px;
margin-top: 20px;
margin-bottom: 30px;
}
.wid-pc-40 {
width: 40%;
margin-top: 20px;
margin-bottom: 30px;
}
}

<style>.max-w1200 {
max-width: 1200px;
margin: 0 auto;
}

.ach-reward-h3 {
background: #F9F8F1;
margin: 2rem 0rem;
}

.ach-reward-h3 img {
width: 95%;
margin: 0 auto;
text-align: center;
display: block;
padding: 2rem 0rem;
}

.ach-reward-box {
position: relative;
color: #4B4204;
background: #F9F8F1;
border: solid 2px #4B4204;
padding: 1.5rem;
font-size: 14px;
line-height: 2;
}

.ach-reward-box::before {
content: '';
position: absolute;
display: inline-block;
background-size: contain;
transform: translateX(-50%)translateY(-50%);
background-repeat: no-repeat;
}

.ach-reward-box::before {
background-image: url('https://pokewaku.jp/wp-content/themes/blankslate-child/assets/images/ach-reward-3.svg');
}

.ach-reward-box::before {
top: -20px;
left: 95%;
width: 110px;
height: 110px;
}

.ach-reward-table {
width: 100%;
margin-bottom: 40px;
}

.ach-reward-table td {
width: calc(100%/2);
text-align: center;
padding: 0.3rem;
border: dotted 2px;
font-size: 12px;
}

.ach-reward-table td:nth-child(1) {
background: #4B4204;
color: #fff;
}

.ach-reward-table td:nth-child(2) {
background: #F9F8F1;
color: #4B4204;
}

@media screen and (max-width: 1199px) {
.ach-reward-h3 img {
margin-bottom: -50px;
}
.ach-reward-flex {
margin: 2rem;
}
.ach-reward-box {
margin-top: 40px;
}
}

@media screen and (min-width: 1200px) {
.ach-reward-h3 img {
max-width: 600px;
margin: 0 auto;
text-align: center;
display: block;
padding: 2rem 0rem;
}
.ach-reward-box {
width: 50%;
margin-left: 40px;
padding: 2rem;
font-size: 16px;
}
.ach-reward-box::before {
top: -25px;
left: 97%;
width: 150px;
height: 150px;
}
.ach-reward-table td {
padding: 0.5rem;
font-size: 16px;
}
.ach-reward-flex {
display: flex;
margin: 40px 0px;
align-items: center;
}
.wid-pc-60 {
width: 55%;
padding-right: 50px;
margin-top: 20px;
margin-bottom: 30px;
}
.wid-pc-40 {
width: 40%;
margin-top: 20px;
margin-bottom: 30px;
}
}