ボタンタグのコードの書き方

ボタンタグの中の文字をボタンないに納めるには
どこのcssをさわればいいですか

html
1   <a href=/themes class="btn-emergency">
2  <span class="btn-emergency-bottom"></span>
3  <span class="btn-emergency-top"><span>あああああ</span></span>
4</a>
5コード

css
1*,
2*:before,
3*:after {
4  -webkit-box-sizing: inherit;
5  box-sizing: inherit;
6}
7
8html {
9  -webkit-box-sizing: border-box;
10  box-sizing: border-box;
11  font-size: 62.5%;
12}
13
14.btn,
15a.btn,
16button.btn {
17  font-size: 1.6rem;
18  font-weight: 700;
19  line-height: 1.5;
20  position: relative;
21  display: inline-block;
22  padding: 1rem 4rem;
23  cursor: pointer;
24  -webkit-user-select: none;
25  -moz-user-select: none;
26  -ms-user-select: none;
27  user-select: none;
28  -webkit-transition: all 0.3s;
29  transition: all 0.3s;
30  text-align: center;
31  vertical-align: middle;
32  text-decoration: none;
33  letter-spacing: 0.1em;
34  color: #212529;
35  border-radius: 0.5rem;
36}
37
38a.btn-emergency {
39  position: relative;
40
41  display: block;
42
43  width: 200px;
44  height: 130px;
45  margin: 0 auto;
46}
47
48a.btn-emergency:hover .btn-emergency-top {
49  top: 10px;
50
51  height: 50px;
52}
53
54a.btn-emergency:active .btn-emergency-top {
55  top: 20px;
56
57  height: 40px;
58}
59
60.btn-emergency-top {
61  position: absolute;
62  top: 0;
63  left: 20px;
64
65  width: 160px;
66  height: 60px;
67  margin-top: 30px;
68
69  -webkit-transition: all 0.3s;
70
71  transition: all 0.3s;
72
73  border-radius: 0 0 50% 50%;
74  background: #d62d2d;
75}
76
77.btn-emergency-top:before {
78  position: absolute;
79  top: -30px;
80  left: 0;
81
82  width: 160px;
83  height: 60px;
84
85  content: "";
86
87  border-radius: 80px / 30px;
88  background: #ed4c4c;
89}
90
91.btn-emergency-top span {
92  font-size: 38px;
93  font-weight: bold;
94
95  position: absolute;
96  top: -24px;
97  left: 0;
98
99  width: 100%;
100
101  -webkit-transform: scaleY(0.75);
102
103  transform: scaleY(0.75);
104  text-align: center;
105
106  color: #f6a3a3;
107}
108
109.btn-emergency-bottom {
110  position: absolute;
111  top: 38px;
112  left: 0;
113
114  width: 200px;
115  height: 80px;
116
117  border-radius: 100px / 40px;
118  background: #d8e4ea;
119  -webkit-box-shadow: 0 8px 0 #c4cacc;
120  box-shadow: 0 8px 0 #c4cacc;
121}
122
123
124Resources![イメージ説明](47dbb8658706646cd0a29092c52a2c8b.png)